Frontent dev env (#247)

* Added frontend development files/environment

* More items-categories related removals

* Improvements in pages templates (inc. static pages)

* Improvements in video player

* Added empty home page message + cta

* Updates in media, playlist and management pages

* Improvements in material icons font loading

* Replaced media & playlists links in frontend dev-env

* frontend package version update

* chnaged frontend dev url port

* static files update

* Changed default position of theme switcher

* enabled frontend docker container

frontend/src/static/js/utils/helpers/errors.js

@@ -0,0 +1,27 @@
+// TODO: Improve or (even better) remove this file code.
+
+import { error as logErrFn, warn as logWarnFn } from './log';
+
+function logAndReturnError(logFn, msgArr, ErrorConstructor) {
+  let err;
+  switch (ErrorConstructor) {
+    case TypeError:
+    case RangeError:
+    case SyntaxError:
+    case ReferenceError:
+      err = new ErrorConstructor(msgArr[0]);
+      break;
+    default:
+      err = new Error(msgArr[0]);
+  }
+  logFn(err.message, ...msgArr.slice(1));
+  return err;
+}
+
+export function logErrorAndReturnError(msgArr, ErrorConstructor) {
+  return logAndReturnError(logErrFn, msgArr, ErrorConstructor);
+}
+
+export function logWarningAndReturnError(msgArr, ErrorConstructor) {
+  return logAndReturnError(logWarnFn, msgArr, ErrorConstructor);
+}