Exit on error when something was wrong executing the command #304
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When something abnormal happens (wrong configuration, missing stuff, connectivity problems, etc., the phpcs execution can end with error.
But, if max-warnings is enabled (>=0), then the count of errors and warnings (that is always 0 on error) gets precedence, hiding the real exit status. Hence it passes, when really it was not executed.
Now we detect those abnormal situations and exit with error when something in the execution goes wrong.
Covered with tests, checking all the possible max-warnings combinations.