Revert "gitclone: don't do anything at update() if develop=true."

This reverts commit ab3bdcfb.

slapos/recipe/gitclone.py

@@ -240,9 +240,7 @@ class Recipe(object):
     If user doesn't develop, reset to remote revision (or branch if revision is
     not specified).
     """
-    if self.develop:
-      return
-
+    try:
       # first cleanup pyc files
       self.deletePycFiles(self.location)
 
@@ -251,10 +249,18 @@ class Recipe(object):
 
       # If develop parameter is set, don't reset/update.
       # Otherwise, reset --hard
+      if not self.develop:
         if self.revision:
           self.gitReset(self.revision)
         else:
           self.gitReset('@{upstream}')
+    except:
+      if not self.develop:
+        raise
+      # Buildout will remove the installed location and mark the part as not
+      # installed if an error occurs during update. If we are developping this
+      # repository we do not want this to happen.
+      print 'Unable to update:\n%s' % traceback.format_exc()
 
 def uninstall(name, options):
   """Keep the working copy, unless develop is set to false.