FilePathCompleter.py: Missing readline module on linux yields crash

Coala-utils crashes on a linux system that has pyreadline installed but doesn't have readline. This happens because we import pyreadline if importing readline fails, but pyreadline is a windows module that doesn't work well on linux.

FilePathCompleter.py:

# GNU readline is not available for Windows
try:
    import readline
except ImportError:  # pragma Linux: no cover
    import pyreadline as readline

Crash Log: https://pastebin.com/GNPh8wtH

Edited May 16, 2018 by Mihai Tiganus

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