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Opened by intrigeri@intrigeri
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poppler optional dependency is required even for mat --help

Hi,

on Debian sid, mat 0.6.1-2, poppler not installed:

$ mat --help
Traceback (most recent call last):
  File "/usr/bin/mat", line 10, in <module>
    from libmat import mat
  File "/usr/lib/python2.7/dist-packages/libmat/mat.py", line 22, in <module>
    import strippers  # this is loaded here because we need LOGGING_LEVEL
  File "/usr/lib/python2.7/dist-packages/libmat/strippers.py", line 29, in <module>
    gi.require_version('Poppler', '0.18')
  File "/usr/lib/python2.7/dist-packages/gi/__init__.py", line 102, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace Poppler not available

gir-poppler is documented as an optional dependency. I think it should either be made optional for real, or be promoted to a hard dependency.