Tell the user to install unicode-slugify in case of ImportError #176 (#206)

core/internals.py

@@ -1,10 +1,17 @@
-from slugify import SLUG_OK, slugify
+import sys
 from core import const
 
-import os
-
 log = const.log
 
+try:
+    from slugify import SLUG_OK, slugify
+except ImportError:
+    log.error('Oops! `unicode-slugify` was not found.')
+    log.info('Please remove any other slugify library and install `unicode-slugify`')
+    sys.exit(5)
+
+import os
+
 formats = { 0  : 'track_name',
             1  : 'artist',
             2  : 'album',
@@ -100,6 +107,7 @@ def filter_path(path):
             os.remove(os.path.join(path, temp))
 
 
+
 def videotime_from_seconds(time):
     if time < 60:
         return str(time)