Return values for functions with return type

Rather than calling pass and letting the function end and
returning None implicitly, which is considered bad style
if the function can return an explicit value elsewhere.

Author: ctrueden

src/scyjava/_convert.py

@@ -789,7 +789,7 @@ def _is_table(obj: Any) -> bool:
         return jinstance(obj, "org.scijava.table.Table")
     except BaseException:
         # No worries if scijava-table is not available.
-        pass
+        return False
 
 
 def _convert_table(obj: Any):
@@ -798,7 +798,7 @@ def _convert_table(obj: Any):
         return _table_to_pandas(obj)
     except BaseException:
         # No worries if scijava-table is not available.
-        pass
+        return None
 
 
 def _import_pandas(required=True):