Fix error with empty knobLabel (Summarize)

Author: duboisR

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "SCILLE_toogle_switch",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "description": "Create toggle switches.",
   "authors": [
     "Romain Dubois <dubois.rom@gmail.com>",

demo/index.html

@@ -79,6 +79,7 @@ <h2>Summarize</h2>
     <button ng-click="summarize = !summarize">Click me</button>
     <p>Summarize toggle-switch: {{summarize}}</p>
     <div sc-toggle-switch-directive is-summarised="summarize" ng-model="switchModel" knob-label="TV"></div>
+    <br /><label>TV</label><div sc-toggle-switch-directive is-summarised="summarize" ng-model="switchModel"></div>
   </div>
 
   <h2>Value labels</h2>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "SCILLE_toogle_switch",
-  "version": "1.0.5",
+  "version": "1.0.9",
   "description": "Create toggle switches.",
   "author": "DUBOIS Romain",
   "contributors": [

release/sc-toggle-switch.min.js

@@ -9,8 +9,9 @@
 </span>
 <span ng-show="isSummarised">
   <div class="sc-toggle-switch-summarize" ng-class="switchSize">
+    <span ng-show="knobLabel != '\u00a0'" class="switch-knob" ng-style="{ 'background-color': knobLabelColor }">{{knobLabel}}</span>
+    <span ng-show="localModel == undefined" class="switch-knob" ng-style="{ 'background-color': knobLabelColor }">null</span>
     <span ng-show="localModel != undefined && localModel" ng-style="{ 'background-color': leftLabelColor }" class="switch-left">{{leftLabel}}</span>
-    <span ng-show="knobLabel.length > 0" class="switch-knob" ng-style="{ 'background-color': knobLabelColor }">{{knobLabel}}</span>
     <span ng-show="localModel != undefined && !localModel" ng-style="{ 'background-color': rightLabelColor }" class="switch-right">{{rightLabel}}</span>
   </div>
 </span>