do not update the treeview if error

src/solidity/localDecoder.js

@@ -3,7 +3,8 @@
 function solidityLocals (vmtraceIndex, internalTreeCall, stack, memory) {
   var scope = internalTreeCall.findScope(vmtraceIndex)
   if (!scope) {
-    return { 'error': 'Can\'t display locals. reason: compilation result might not have been provided' }
+    var error = { 'message': 'Can\'t display locals. reason: compilation result might not have been provided' }
+    throw error
   }
   var locals = {}
   memory = formatMemory(memory)

src/ui/SolidityLocals.js

@@ -16,18 +16,26 @@ class SolidityLocals {
       extractData: solidityTypeFormatter.extractData
     })
     this.init()
+    this.view
   }
 
   render () {
-    return yo`<div id='soliditylocals' >${this.basicPanel.render()}</div>`
+    this.view = yo`<div id='soliditylocals' >
+    <div id='warning'></div>
+    ${this.basicPanel.render()}
+    </div>`
+    return this.view
   }
 
   init () {
     this.parent.event.register('indexChanged', this, (index) => {
+      var warningDiv = this.view.querySelector('#warning')
+      warningDiv.innerHTML = ''
       if (index < 0) {
-        this.basicPanel.update({info: 'invalid step index'})
+        warningDiv.innerHTML = 'invalid step index'
         return
       }
+      
       if (this.parent.currentStepIndex !== index) return
       
       this.traceManager.waterfall([
@@ -38,8 +46,12 @@ class SolidityLocals {
           if (!error) {
             var stack = result[0].value
             var memory = result[1].value
+            try {
               var locals = localDecoder.solidityLocals(index, this.internalTreeCall, stack, memory)
               this.basicPanel.update(locals)
+            } catch (e) {
+              warningDiv.innerHTML = e.message
+            }
           }
         })
     })

src/ui/SolidityState.js

@@ -15,22 +15,30 @@ function SolidityState (_parent, _traceManager, _codeManager, _solidityProxy) {
     extractData: solidityTypeFormatter.extractData
   })
   this.init()
+  this.view
 }
 
 SolidityState.prototype.render = function () {
-  return yo`<div id='soliditystate' >${this.basicPanel.render()}</div>`
+  this.view = yo`<div id='soliditystate' >
+      <div id='warning'></div>
+      ${this.basicPanel.render()}
+    </div>`
+  return this.view
 }
 
 SolidityState.prototype.init = function () {
   var self = this
   this.parent.event.register('indexChanged', this, function (index) {
+    var warningDiv = this.view.querySelector('#warning')
+    warningDiv.innerHTML = ''
     if (index < 0) {
-      self.basicPanel.update({info: 'invalid step index'})
+      warningDiv.innerHTML = 'invalid step index'
       return
     }
+
     if (self.parent.currentStepIndex !== index) return
     if (!this.solidityProxy.loaded()) {
-      self.basicPanel.update({info: 'no source has been specified'})
+      warningDiv.innerHTML = 'no source has been specified'
       return
     }