[modules/git] Make CI (hopefully) run through

OK, so I cannot configure Travis to install pygit2, obviously. Instead,
I'll make the "git" module run though even if pygit2 is not installed.

Hope that satisfies you, Travis!

.travis.yml

@@ -1,6 +1,5 @@
 sudo: false
 language: python
-dist: xenial
 python:
   - "2.7"
   - "3.3"
@@ -9,7 +8,7 @@ python:
   - "3.6"
 before_install:
   - sudo apt-get -qq update
-  - sudo apt-get install -y task libgit2 libgit2-dev
+  - sudo apt-get install -y task
 install:
   - pip install i3ipc
   - pip install psutil
@@ -17,7 +16,6 @@ install:
   - pip install -U coverage==4.3
   - pip install codeclimate-test-reporter
   - pip install taskw
-  - pip install pygit2
 script:
   - nosetests -v --with-coverage --cover-erase tests/
   - CODECLIMATE_REPO_TOKEN=40cb00907f7a10e04868e856570bb997ab9c42fd3b63d980f2b2269433195fdf codeclimate-test-reporter

bumblebee/modules/git.py

@@ -10,7 +10,11 @@ Requires:
 
 import os
 import string
-import pygit2
+import logging
+try:
+    import pygit2
+except ImportError:
+    pass
 
 import bumblebee.input
 import bumblebee.output
@@ -59,7 +63,8 @@ class Module(bumblebee.engine.Module):
             self._error = False
         except Exception as e:
             self._error = True
-            return e
+            logging.error(e)
+            return "n/a"
 
         return string.Formatter().vformat(self._fmt, (), data)