Description of problem:

Passing an invalid Git ref to `rhc deploy` with an app configured for `--no-auto-deploy` corrupts the app-deployments directory and leaves the gear stopped and broken.

Version-Release number of selected component (if applicable):


How reproducible:

Create a nodejs 0.6 application with `--no-auto-deploy` and run `rhc deploy` with an invalid Git ref.


Steps to Reproduce:
1. rhc app-create nodeapp nodejs-0.6
2. rhc configure-app -a nodeapp --no-auto-deploy
3. push a change to the application to receive a new Git ref and verify that the app still works
4. rhc deploy bogusrefid -a nodeapp

Actual results:

A cryptic error message such as:

Deployment of git ref 'd015767a' in progress for application nodeapp ...
Stopping NodeJS cartridge
Saving away previously installed Node modules
An error occurred executing 'gear deploy' (exit code: 1)
Error message: Shell command '
set -xe;
shopt -s dotglob;
if [ "$(find objects -type f 2>/dev/null | wc -l)" -eq "0" ]; then
  exit 0;
fi
git archive --format=tar d015767a | (cd
/var/lib/openshift/525fe917a9b79abcce000030/app-deployments/2013-10-17_09-59-49.869/repo && tar --warning=no-timestamp -xf
-);
' returned an error. rc=1
stdout: 
stderr: + shopt -s dotglob
++ find objects -type f
++ wc -l
+ '[' 28 -eq 0 ']'
+ git archive --format=tar d015767a
+ cd /var/lib/openshift/525fe917a9b79abcce000030/app-deployments/2013-10-17_09-59-49.869/repo
+ tar --warning=no-timestamp -xf -
fatal: Not a valid object name
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors

For more details about the problem, try running the command again with the '--trace' option.
Success


Additionally:
* The current deployment symlink is missing from ~/app-deployments/by-id which is an invalid state/gear corruption
* The gear is now in a stopped state


Expected results:

A meaningful error message and no deployment attempt.


Additional info: