Fix/279 start documents uri not found (#439)

* added exception to not throw error on empty key

* changed find in array method

* condition to only load links on start when provided

* changed to use of parameter lax

app/Application.js

@@ -182,7 +182,9 @@ Ext.define('EdiromOnline.Application', {
 
     openStartDocuments: function() {
         var me = this;
-        var uris = me.getController('PreferenceController').getPreference('start_documents_uri');
-        window.loadLink(uris);
+        var uris = me.getController('PreferenceController').getPreference('start_documents_uri', true);
+        if(uris){
+            window.loadLink(uris);
+        }
     }
 });

app/controller/PreferenceController.js

@@ -64,6 +64,7 @@ Ext.define('EdiromOnline.controller.PreferenceController', {
     getPreference: function(key, lax) {
         var me = this;
 
+        // if key does not exist but lax is true, return null
         if(!me.preferences[key] && lax)
             return null;
 
@@ -86,7 +87,7 @@ Ext.define('EdiromOnline.controller.PreferenceController', {
                 key: key,
                 level: 'warn' //warn, error, fatal
             });
-
+        
             return null;
         }