Network following crashing when levels are missing

[sjib]

Describe the bug
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When selecting network following upstream on node V1.102 a python error appears and cursors keep turning (blue circle). Difficult to work on.

To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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No half crash if using network following function

Screenshots / data
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2024-10-28T11:59:34     WARNING    Traceback (most recent call last):
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwmaptools.py", line 145, in canvasReleaseEvent
              self.leftClicked(event)
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwmaptools.py", line 559, in leftClicked
              self.getTree(match.featureId())
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwmaptools.py", line 508, in getTree
              nodes, edges = self.network_analyzer.getTree(node_id, upstream)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwnetwork.py", line 298, in getTree
              pred, _ = nx.bellman_ford_predecessor_and_distance(my_graph, node)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File "C:\PROGRA~1\QGIS 3.34.8\apps\Python312\Lib\site-packages\networkx\utils\decorators.py", line 789, in func
              return argmap._lazy_compile(__wrapper)(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File " compilation 4", line 3, in argmap_bellman_ford_predecessor_and_distance_1
              import gzip
              ^^^^
              File "C:\PROGRA~1\QGIS 3.34.8\apps\Python312\Lib\site-packages\networkx\utils\backends.py", line 633, in __call__
              return self.orig_func(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File "C:\PROGRA~1\QGIS 3.34.8\apps\Python312\Lib\site-packages\networkx\algorithms\shortest_paths\weighted.py", line 1246, in bellman_ford_predecessor_and_distance
              raise nx.NodeNotFound(f"Node {source} is not found in the graph")
             networkx.exception.NodeNotFound: Node 82 is not found in the graph
             
2024-10-28T12:00:43     WARNING    Traceback (most recent call last):
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwmaptools.py", line 145, in canvasReleaseEvent
              self.leftClicked(event)
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwmaptools.py", line 559, in leftClicked
              self.getTree(match.featureId())
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwmaptools.py", line 508, in getTree
              nodes, edges = self.network_analyzer.getTree(node_id, upstream)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File "C:\Users/Stefan/AppData/Roaming/QGIS/QGIS3\profiles\tww_pre_202403/python/plugins\teksi_wastewater\tools\twwnetwork.py", line 298, in getTree
              pred, _ = nx.bellman_ford_predecessor_and_distance(my_graph, node)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File " compilation 4", line 3, in argmap_bellman_ford_predecessor_and_distance_1
              import gzip
              ^^^^
              File "C:\PROGRA~1\QGIS 3.34.8\apps\Python312\Lib\site-packages\networkx\utils\backends.py", line 633, in __call__
              return self.orig_func(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
              File "C:\PROGRA~1\QGIS 3.34.8\apps\Python312\Lib\site-packages\networkx\algorithms\shortest_paths\weighted.py", line 1246, in bellman_ford_predecessor_and_distance
              raise nx.NodeNotFound(f"Node {source} is not found in the graph")
             networkx.exception.NodeNotFound: Node 82 is not found in the graph

Desktop (please complete the following information):

• TWW version 2024.0.3
• QGIS Version 3.34.8
• OS Win 10

Additional context
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Looks like levels (cote attributes) are missing in this part of (secondary) network

[sjib]

No reach_point levels

[sjib]

No cover level

[sjib]

Bottom level exists: