fix wrong fetch errors registering

Author: nleush

lib/plugins/system/meta/cachedMeta.js

@@ -83,8 +83,9 @@ export default {
                             }
                         }
 
-                        if (data.error.responseStatusCode !== 200) {
-                            // TODO: why `data.error.responseStatusCode` can be `undefined`
+                        // Redirects don't have `responseStatusCode`. Only errors have status.
+                        if (data.error.responseStatusCode 
+                            && data.error.responseStatusCode !== 200) {
                             options.registerFetchError({
                                 source: 'cache',
                                 url: url,
@@ -97,7 +98,9 @@ export default {
                         cb(data.error);
                     } else if (data.htmlparser) {
 
-                        if (data.htmlparser.__statusCode !== 200) {
+                        // Wrong content types don't have `__statusCode`. Only errors have status.
+                        if (data.htmlparser.__statusCode 
+                            && data.htmlparser.__statusCode !== 200) {
                             // TODO: why `data.htmlparser.__statusCode` can be `undefined`
                             options.registerFetchError({
                                 source: 'cache',