[SPARK-9942] [PYSPARK] [SQL] ignore exceptions while try to import pandas

If pandas is broken (can't be imported, raise other exceptions other than ImportError), pyspark can't be imported, we should ignore all the exceptions.

Author: Davies Liu <davies@databricks.com>

Closes #8173 from davies/fix_pandas.

python/pyspark/sql/context.py

@@ -39,7 +39,7 @@ from pyspark.sql.functions import UserDefinedFunction
 try:
     import pandas
     has_pandas = True
-except ImportError:
+except Exception:
     has_pandas = False
 
 __all__ = ["SQLContext", "HiveContext", "UDFRegistration"]