Meta: Don't halt if importing a test fails in WPT.sh

Meta/WPT.sh

@@ -222,19 +222,28 @@ import_wpt()
     done
 
     TESTS=()
-    mapfile -t TESTS < <( "${ARG0}" list-tests "${INPUT_PATHS[@]}" )
+    while IFS= read -r test_file; do
+        TESTS+=("$test_file")
+        done < <(
+            "${ARG0}" list-tests "${INPUT_PATHS[@]}"
+        )
     if [ "${#TESTS[@]}" -eq 0 ]; then
         echo "No tests found for the given paths"
         exit 1
     fi
 
     pushd "${LADYBIRD_SOURCE_DIR}" > /dev/null
         ./Meta/ladybird.sh build headless-browser
+        set +e
         for path in "${TESTS[@]}"; do
             echo "Importing test from ${path}"
             ./Meta/import-wpt-test.py https://wpt.live/"${path}"
+            if [ ! "$(./Meta/import-wpt-test.py https://wpt.live/"${path}")" ]; then
+                continue
+            fi
             "${HEADLESS_BROWSER_BINARY}" --run-tests ./Tests/LibWeb --rebaseline -f "$path"
         done
+        set -e
     popd > /dev/null
 }