Stack simplification removing, more precise HasImage checking, Question getting small fix

stable.js

@@ -21,7 +21,7 @@
 
 // ==UserScript==
 // @name         Moodle/Elearning/KMOOC test help
-// @version      1.6.4.0
+// @version      1.6.4.1
 // @description  Online Moodle/Elearning/KMOOC test help
 // @author       MrFry
 // @match        https://elearning.uni-obuda.hu/main/*
@@ -239,23 +239,7 @@
     }
 
     SimplifyStack (stack) {
-      stack = this.SimplifyQuery(stack)
-      let ns = ''
-      let adding = true
-      stack.split('').forEach((c) => {
-        if (c === '(') {
-          adding = false
-        }
-
-        if (adding) {
-          ns += c
-        }
-
-        if (c === ')') {
-          adding = true
-        }
-      })
-      return ns
+      return this.SimplifyQuery(stack)
     }
   }
 
@@ -281,7 +265,7 @@
     }
 
     HasImage () {
-      return this.I !== undefined
+      return this.I !== undefined && (typeof this.I === 'string' || Array.isArray(this.I))
     }
 
     IsComplete () {
@@ -568,8 +552,10 @@
         Log('Some error with images')
       }
 
-      questions = questions.map((item, ind) => {
-        return SUtils.ReplaceCharsWithSpace(item, '\n')
+      questions = questions.map((item) => {
+        if (item) {
+          return SUtils.ReplaceCharsWithSpace(item, '\n')
+        }
       })
 
       return {