[pitivi] bin: Source the completions only when present

[Alexandru Băluț <alexbalut src gnome org>]

commit d95c759957ea615e8ebe3b1e5882d93d13d80322
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Mon Apr 11 13:27:58 2016 +0200

    bin: Source the completions only when present

 bin/pitivi-git-environment.sh |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)
---
diff --git a/bin/pitivi-git-environment.sh b/bin/pitivi-git-environment.sh
index a35a594..5d6b7ab 100755
--- a/bin/pitivi-git-environment.sh
+++ b/bin/pitivi-git-environment.sh
@@ -519,9 +519,13 @@ if [ "$ready_to_run" = "1" ]; then
         else
             function generate_path_and_completion_calls {
                 echo "export PATH=$EXTRA_PATH:\$PATH"
-                echo "source $MYPITIVI/gstreamer/data/completions/gst-launch-1.0"
-                echo "source $MYPITIVI/gstreamer/data/completions/gst-inspect-1.0"
-                echo "source $MYPITIVI/gst-editing-services/data/completions/ges-launch-1.0"
+                if [[ -d $MYPITIVI/gstreamer ]]; then
+                    echo "source $MYPITIVI/gstreamer/data/completions/gst-launch-1.0"
+                    echo "source $MYPITIVI/gstreamer/data/completions/gst-inspect-1.0"
+                fi
+                if [[ -d $MYPITIVI/gst-editing-services ]]; then
+                    echo "source $MYPITIVI/gst-editing-services/data/completions/ges-launch-1.0"
+                fi
             }
 
             cd $PITIVI/pitivi