Do not throw an error when a model fetch returns a 404 (#1378)

Author: rjpals

src/shell/store/models.js

@@ -99,15 +99,21 @@ export function fetchModel(modelZUID) {
             type: "FETCH_MODEL_SUCCESS",
             payload: res.data,
           });
+        } else if (res.status === 404) {
+          /*
+            Do nothing; this most likely means the model existed at one point
+            and was deleted. This action may be improved in the future if
+            the ability to fetch deleted items is added to the api
+          */
         } else {
           dispatch(
             notify({
               kind: "warn",
               message: `Failed to fetch models`,
             })
           );
-          if (res.error || res.status === 404) {
-            throw new Error(res.error);
+          if (res.error || res.message) {
+            throw new Error(res.error || res.message);
           }
         }
       },