Update listExtensions.m (#780)

Author: ehennestad

+matnwb/+extension/listExtensions.m

@@ -39,7 +39,8 @@
         catalogUrl = "https://raw.githubusercontent.com/nwb-extensions/nwb-extensions.github.io/refs/heads/main/data/records.json";
         extensionRecords = jsondecode(webread(catalogUrl));
         extensionRecords = consolidateStruct(extensionRecords);
-                    
+        extensionRecords = removeUnnamedExtensions(extensionRecords);
+        
         extensionRecords = struct2table(extensionRecords);
 
         fieldsKeep = ["name", "version", "last_updated", "src", "license", "maintainers", "readme"];
@@ -81,3 +82,14 @@
         end
     end
 end
+
+function extensionRecords = removeUnnamedExtensions(extensionRecords)
+    % Only keep extensions that have a name
+    keep = false(1, numel(extensionRecords));
+    for i = 1:numel(extensionRecords)
+        if ~isempty(extensionRecords(i).name)
+            keep(i) = true;
+        end
+    end
+    extensionRecords = extensionRecords(keep);
+end