Fix scorecard warning summaries

scripts/scorecard

@@ -10,6 +10,7 @@ score() {
     local severity="$2"
     shift 2
     local output
+    local summary
     local status
 
     printf '%-28s ' "$label"
@@ -28,9 +29,14 @@ score() {
         warnings=$((warnings + 1))
         printf 'warn'
     fi
-    if [ -n "$output" ]; then
-        printf ' - %s' "$(printf '%s' "$output" | grep -v '^+' | head -n 1)"
+    summary="$(
+        printf '%s\n' "$output" |
+            awk 'NF && $0 !~ /^\+/ { print; exit }'
+    )"
+    if [ -z "$summary" ]; then
+        summary="check exited with status ${status}"
     fi
+    printf ' - %s' "$summary"
     printf '\n'
 }