f xlsimporter error

Summary

Fixes #52 (closed)

Focus

After trying to read a file without a proper ending, the pandas.io.excel.ExcelFile function throws a ValueError. I think, the XLRDError is thrown if a broken xls file is present, but with a correct ending.

Test Environment

I used pytest.

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assigned to @al-kr

marked the checklist item All automated tests pass as completed

marked the checklist item Reference related Issues as completed

resolved all threads

mentioned in commit 289f60fe

merged