Merge pull request #1830 from remram44/vcs-not-found_2

Catches BadCommand in get_src_requirement()

pip/vcs/__init__.py

@@ -4,6 +4,7 @@
 import shutil
 
 from pip.compat import urlparse, urllib
+from pip.exceptions import BadCommand
 from pip.log import logger
 from pip.util import (display_path, backup_dir, find_command,
                       rmtree, ask_path_exists)
@@ -242,7 +243,15 @@ def get_src_requirement(self, dist, location, find_tags=False):
 def get_src_requirement(dist, location, find_tags):
     version_control = vcs.get_backend_from_location(location)
     if version_control:
-        return version_control().get_src_requirement(dist, location, find_tags)
+        try:
+            return version_control().get_src_requirement(dist,
+                                                         location,
+                                                         find_tags)
+        except BadCommand:
+            logger.warn('cannot determine version of editable source in %s '
+                        '(%s command not found in path)' % (
+                            location, version_control.name))
+            return dist.as_requirement()
     logger.warn(
         'cannot determine version of editable source in %s (is not SVN '
         'checkout, Git clone, Mercurial clone or Bazaar branch)' % location