fix issues with lack of view

src/app/debugger/debuggerUI/ButtonNavigator.js

@@ -128,6 +128,7 @@ ButtonNavigator.prototype.updateDisabled = function (id, disabled) {
 }
 
 ButtonNavigator.prototype.resetWarning = function (revertedReason) {
+  if (!this.view) return
   this.view.querySelector('#reverted #outofgas').style.display = (revertedReason === 'outofgas') ? 'inline' : 'none'
   this.view.querySelector('#reverted #parenthasthrown').style.display = (revertedReason === 'parenthasthrown') ? 'inline' : 'none'
   this.view.querySelector('#reverted').style.display = (revertedReason === '') ? 'none' : 'block'

src/app/debugger/debuggerUI/Slider.js

@@ -13,6 +13,7 @@ class Slider {
   }
 
   setSliderLength (length) {
+    if (!this.view) return
     this.view.querySelector('#slider').setAttribute('max', length - 1)
     this.max = length - 1
     this.disabled = (length === 0)
@@ -27,6 +28,7 @@ class Slider {
   }
 
   onChange (event) {
+    if (!this.view) return
     var value = parseInt(this.view.querySelector('#slider').value)
     if (value === this.previousValue) return
 
@@ -35,6 +37,7 @@ class Slider {
   }
 
   setValue (value) {
+    if (!this.view) return
     this.view.querySelector('#slider').value = value
   }
 

src/app/debugger/debuggerUI/StepManager.js

@@ -35,6 +35,7 @@ StepManager.prototype.startButtonNavigator = function () {
 }
 
 StepManager.prototype.updateStep = function (step, stepState, jumpOutDisabled) {
+  if (!this.slider) return
   this.slider.setValue(step)
   this.buttonNavigator.stepChanged(stepState, jumpOutDisabled)
   this.event.trigger('stepChanged', [step])