wrap filters/conditionals in a try-except block

allows accessing undefined fields without exception or locals().get(…)
but hides mistakes/typos/etc by evaluating to False without feedback

performance loss compared to the previous version without try-except
is negligible (~20ns for me)

docs/configuration.rst

@@ -6085,6 +6085,18 @@ Description
     this cache.
 
 
+filters-environment
+-------------------
+Type
+    ``bool``
+Default
+    ``true``
+Description
+    Evaluate filter expressions raising an exception as ``false``
+    instead of aborting the current extractor run
+    by wrapping them in a `try`/`except` block.
+
+
 format-separator
 ----------------
 Type