don't push a change to container.yaml if SHA is blank

Change-Id: I37efa3c54a8a6a4951008d3ea3e028c4bdc6c1f9
Signed-off-by: nickboldt <[email protected]>

product/updateContainerYamlSHAs.sh

@@ -89,11 +89,11 @@ for yaml in $yamls; do
 
           # Try branch (/heads/)
           if [[ ! $SHA ]]; then
-            SHA=$(git ls-remote $repo refs/heads/$branchOrTag | sed -r -e "s@(.+)\\t.+@\\1@g")
+            SHA=$(git ls-remote $repo refs/heads/$branchOrTag | sed -r -e "s@(.+)\\t.+@\\1@g" | tr -d " ")
           fi
           # Use tag (/tags/) if branch does not exist
           if [[ ! $SHA ]]; then
-            SHA=$(git ls-remote $repo refs/tags/$branchOrTag | sed -r -e "s@(.+)\\t.+@\\1@g")
+            SHA=$(git ls-remote $repo refs/tags/$branchOrTag | sed -r -e "s@(.+)\\t.+@\\1@g" | tr -d " ")
           fi
           # Or if there's a SHA in job-config.json, use that directly
           if [[ ! $SHA ]]; then
@@ -102,7 +102,9 @@ for yaml in $yamls; do
           # sed replacement (match a line, move *N*ext line and *S*ubstitute it) will only work for this 2-line pattern:
           #   repo: https://github.com/redhat-developer/devspaces-images.git
           #    ref: e8b28394b00f6d320ec7a9b758875c674595ed58
-          sed -r -i -e "/.+repo: .+${repo##*/}.*/{n;s/ref: .*/ref: $SHA/}" $yaml
+          if [[ $SHA ]]; then
+            sed -r -i -e "/.+repo: .+${repo##*/}.*/{n;s/ref: .*/ref: $SHA/}" $yaml
+          fi
       done
   else
     echo "No 'remote_sources:' found in $yaml, nothing to do!"