Handle 404 when there are no files when fetching GitLab Tree list.

Author: sowerstl

src/main/java/gov/osti/connectors/api/GitLabAPI.java

@@ -467,7 +467,16 @@ public GitLabFile[] fetchTree() throws IOException {
      * @throws IOException
      */
     public GitLabFile[] fetchTree(String path) throws IOException {
-        String response = fetch(gitLabAPIGet(acquireTreeCmd(path)));
+        String response = "";
+        try {
+            response = fetch(gitLabAPIGet(acquireTreeCmd(path)));
+        } catch (IOException e) {
+            // if we didn't find Files on GET, its okay, they just doesn't exist.  Return NULL.
+            if (!e.getMessage().equals("Failed response: " + HttpServletResponse.SC_NOT_FOUND))
+                throw e;
+
+            return null;
+        }
         return MAPPER.readValue(response, GitLabFile[].class);
     }
 

src/main/java/gov/osti/services/Metadata.java

@@ -1949,19 +1949,22 @@ private static void processOSTIGitLab(DOECodeMetadata md, String filePath, Strin
             int adds = 0;
             int updates = 0;
             int deletes = 0;
-            for ( GitLabFile f : files ) {
-                if (!f.getType().equalsIgnoreCase("tree")) {
-                    if (f.getPath().equals(uploadFile)) {
-                        // update, if filename exists already
-                        commit.addBase64ActionByValues("update", uploadFile, base64Content);
 
-                        updates++;
-                    }
-                    else {
-                        // delete, if file is not being submitted
-                        commit.addBase64ActionByValues("delete", f.getPath(), null);
+            if (files != null) {
+                for ( GitLabFile f : files ) {
+                    if (!f.getType().equalsIgnoreCase("tree")) {
+                        if (f.getPath().equals(uploadFile)) {
+                            // update, if filename exists already
+                            commit.addBase64ActionByValues("update", uploadFile, base64Content);
+
+                            updates++;
+                        }
+                        else {
+                            // delete, if file is not being submitted
+                            commit.addBase64ActionByValues("delete", f.getPath(), null);
 
-                        deletes++;
+                            deletes++;
+                        }
                     }
                 }
             }