More lines for coverage to ignore

These lines are hit by python version or if the test suite is being run
from django. So they are to ensure that things continue to work at weird
configurations that I haven't found how to test on Travis.

Author: gaqzi

.coveragerc

@@ -2,4 +2,9 @@
 source = emoji
 
 [report]
-omit = emoji/tests.py, emoji/_unicode_characters.py
+omit = emoji/tests.py, emoji/_unicode_characters.py
+exclude_lines =
+              UNICODE_WIDE
+              except NoReverseMatch
+              except ImportError
+              pragma: no cover

emoji/models.py

@@ -16,7 +16,7 @@
 UNICODE_WIDE = True
 try:
     unichr(0x0001f48b)
-except ValueError:
+except ValueError:  # pragma: no cover
     import unicodedata
 
     UNICODE_WIDE = False