Fix missing param (#407)

* Fix missing param

* Use empty string as default param

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Co-authored-by: admin <[email protected]>

Author: shallyan

src/datatrove/pipeline/extractors/base.py

@@ -82,7 +82,7 @@ def run(self, data: DocumentsPipeline, rank: int = 0, world_size: int = 1) -> Do
 
 
 class ExtractorSandbox:
-    def __init__(self, timeout, wamup_text):
+    def __init__(self, timeout, wamup_text=""):
         self.timeout = timeout
         self.process = None
         self.parent_conn = None