fix(#802): add fallback to default versions if search returns errors (#811)

Author: wing328

.github/workflows/build.yml

@@ -84,6 +84,7 @@ jobs:
           (npm run oa version-manager set 4.0 && npm run oa version | grep -q '4.0.3') || exit 1
           (npm run oa version-manager set 4.3.1 && npm run oa version | grep -q '4.3.1') || exit 1
           (npm run oa version-manager set 4.3.1 && npm run oa version | grep -q '4.3.1') || exit 1
+          (export OPENAPI_GENERATOR_CLI_SEARCH_URL=DEFAULT && npm run oa version-manager set 7.2.0 && npm run oa version | grep -q '7.2.0') || exit 1
           json -I -f openapitools.json -e 'this["generator-cli"]["storageDir"]="./my/storage/"'
           (npm run oa version-manager set 4.3.0 && npm run oa version | grep -q '4.3.0') || exit 1
           test -f ./my/storage/4.3.0.jar || exit 1