[12.0][FIX] Improved code of stage create method.

Author: rutul-serpentcs

fieldservice/models/fsm_stage.py

@@ -73,8 +73,8 @@ def get_color_information(self):
     def create(self, vals):
         stages = self.env['fsm.stage'].search([])
         for stage in stages:
-            if stage.stage_type == vals['stage_type'] and \
-               stage.sequence == vals['sequence']:
+            if stage.stage_type == vals.get('stage_type') and \
+               stage.sequence == vals.get('sequence'):
                 raise ValidationError(_("Cannot create FSM Stage because "
                                         "it has the same Type and Sequence "
                                         "of an existing FSM Stage."))