add check for existing data before collecting

Signed-off-by: Charlie Wheeler-Robinson <[email protected]>

cmd/e2e.sh

@@ -269,9 +269,14 @@ EOF
 
 audit_container > $DATADIR/repo_audit
 if [ ! -z "$LOCAL_KUBECONFIG" ]; then
-    echo "Running Collection"
-    verify_env
-    collect_data
+    if [ -z "$( find $OUTPUTDIR/* -prune -type f 2>/dev/null )" ]; then
+        echo "Running Collection"
+        verify_env
+        collect_data
+    else
+        echo "Cannot run data collection when $OUTPUTDIR contains files."
+        exit 1
+    fi
 else
     echo "Skipping data collection"
 fi