added placeholder files

Author: philimon-reset

.github/workflows/l10n.yml

@@ -109,6 +109,7 @@ jobs:
             echo "Running tests for: $line";
             pipenv run python -m l10n_CM.run_l10n --fx-executable="$FX_EXECUTABLE" $line || SCRIPT_EXIT_CODE=$?;
           done < selected_l10n_mappings;
+          ls artifacts-mac/* &>/dev/null || echo "No mappings to report" >> artifacts-mac/placeholder.txt
           mv -n artifacts/* artifacts-mac/ || true;
           EXIT_CODE=$(cat TEST_EXIT_CODE);
           if [ $EXIT_CODE != 0 ]; then
@@ -191,6 +192,7 @@ jobs:
             echo "Running tests for: $line";
             DISPLAY=:99 pipenv run python -m l10n_CM.run_l10n --fx-executable="$FX_EXECUTABLE" $line || SCRIPT_EXIT_CODE=$?;
           done < selected_l10n_mappings;
+          ls artifacts-linux/* &>/dev/null || echo "No mappings to report" >> artifacts-linux/placeholder.txt
           mv -n artifacts/* artifacts-linux/ || true;
           EXIT_CODE=$(cat TEST_EXIT_CODE);
           if [ $EXIT_CODE != 0 ]; then
@@ -330,7 +332,7 @@ jobs:
           }
           mkdir artifacts-win -Force
           if (-not (Test-Path -Path "artifacts-win\*")) {
-            New-Item -Path "artifacts-win\placeholder.txt" -ItemType File
+            New-Item -Path "artifacts-win\placeholder.txt" -ItemType File -Value "no mappings to report."
           }
           $EXIT_CODE = Get-Content -Path "TEST_EXIT_CODE"
           if ($EXIT_CODE -ne 0) {