fix: handle statements with only semicolons/whitespace#500
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Input consisting solely of ';' produced a statement whose first token is Punctuation. stmt_type then called re.findall(r'[\w]+', ';')[0], raising IndexError. Skip empty statements in _process_sql and harden stmt_type to return '' when the statement contains no word tokens. Fixes crate#499
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Fixes #499.
Entering
;at the crash prompt crashed withIndexError: list index out of range. The first token of the parsed statement is a Punctuation, andre.findall(r'[\w]+', ';')[0]indexes an empty list. Skip empty statements in_process_sqland hardenstmt_typeto return''when the statement has no word tokens. Regression test added inCommandUtilsTest.test_stmt_type_punctuation_only_does_not_crash.