no break a search when 401 is returned (#394)

Co-authored-by: Liam Newman <[email protected]>

Author: joseblas

src/main/java/com/cloudbees/jenkins/plugins/bitbucket/server/client/BitbucketServerAPIClient.java

@@ -510,7 +510,9 @@ public boolean checkPathExists(@NonNull String branchOrHash, @NonNull String pat
         int status = getRequestStatus(url);
         if (HttpStatus.SC_OK == status) {
             return true;
-        } else if (HttpStatus.SC_NOT_FOUND == status) {
+            // BitBucket return UNAUTHORIZED when no credentials are provided
+            // https://support.atlassian.com/bitbucket-cloud/docs/use-bitbucket-rest-api-version-1/
+        } else if (HttpStatus.SC_NOT_FOUND == status || HttpStatus.SC_UNAUTHORIZED == status) {
             return false;
         } else {
             throw new IOException("Communication error for url: " + path + " status code: " + status);