Fix error and silent failure in Git hooks install script (#3914)

Author: brentmaas

.githooks/install

@@ -3,5 +3,9 @@
 cd $(git rev-parse --git-dir)
 
 echo "Installing hooks..." 
-ln -s ../.githooks hooks
-echo "Done!"
+ln -sT ../.githooks hooks
+if [ $? -eq 0 ]; then
+    echo "Done!"
+else
+    echo "Hooks failed to install: .git/hooks already exists or cannot be created"
+fi