Use more explicit checks on .length for readability

lib/upload-lib.js

@@ -387,7 +387,7 @@ function validateSarifFileSchema(sarif, sarifFilePath, logger) {
     for (const warning of warnings) {
         logger.info(`Warning: '${warning.instance}' is not a valid URI in '${warning.property}'.`);
     }
-    if (errors.length) {
+    if (errors.length > 0) {
         // Output the more verbose error messages in groups as these may be very large.
         for (const error of errors) {
             logger.startGroup(`Error details: ${error.stack}`);