[pitivi] bin: Avoid aliasing error messages

[Alexandru Băluț <alexbalut src gnome org>]

commit f5fff1d09e8b0e595c239edd66d74f2939c7a463
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Apr 15 01:14:18 2016 +0200

    bin: Avoid aliasing error messages
    
    Differential Revision: https://phabricator.freedesktop.org/D940

 bin/pitivi-xdg-app-env |   22 ++++++++++++----------
 1 files changed, 12 insertions(+), 10 deletions(-)
---
diff --git a/bin/pitivi-xdg-app-env b/bin/pitivi-xdg-app-env
index b03d83f..47cb9c9 100755
--- a/bin/pitivi-xdg-app-env
+++ b/bin/pitivi-xdg-app-env
@@ -29,13 +29,15 @@ alias ptivi-xdg-app="$XDGAPP_ENVPATH/pitivi/bin/pitivi-xdg-app -b"
 
 echo "-> Setting up environment if needed:"
 ptvenv "echo '===> Environment ready'"
-
-for i in `ptvenv ls /app/bin/`;
-do
-    alias $i="$XDGAPP_ENVPATH/pitivi/bin/pitivi-xdg-app -b $i"
-done
-
-alias pitivi="cd $XDGAPP_ENVPATH/pitivi && $XDGAPP_ENVPATH/pitivi/bin/pitivi-xdg-app -b bin/pitivi && cd - > 
/dev/null"
-
-export PS1="(ptv-xdgapp) $PS1"
-export PATH="$XDGAPP_ENVPATH/bin/:$PATH"
+if [ "$?" = "0" ];
+then
+    for i in `ptvenv ls /app/bin/`;
+    do
+        alias $i="$XDGAPP_ENVPATH/pitivi/bin/pitivi-xdg-app -b $i"
+    done
+
+    alias pitivi="cd $XDGAPP_ENVPATH/pitivi && $XDGAPP_ENVPATH/pitivi/bin/pitivi-xdg-app -b bin/pitivi && cd 
- > /dev/null"
+
+    export PS1="(ptv-xdgapp) $PS1"
+    export PATH="$XDGAPP_ENVPATH/bin/:$PATH"
+fi