Bug 954614 - Fix 'Reference to undefined property' JS warnings in buddytooltip.xml, blist.js and account.xml, r=florian.

im/content/account.xml

@@ -244,7 +244,8 @@
        <![CDATA[
          // If we have a reconnect timer, stop it:
          // it will throw errors otherwise (see bug 480).
-         // clearInterval is harmless if the timer doesn't exist.
+         if (!this.reconnectUpdateInterval)
+           return;
          clearInterval(this.reconnectUpdateInterval);
          delete this.reconnectUpdateInterval;
        ]]>

im/content/blist.js

@@ -584,6 +584,7 @@ var buddyList = {
     this.displayNameRefreshTimer();
   },
 
+  _stopEditDisplayNameTimeout: 0,
   displayNameRefreshTimer: function bl_displayNameRefreshTimer() {
     const timeBeforeAutoValidate = 20 * 1000;
     clearTimeout(this._stopEditDisplayNameTimeout);

im/content/buddytooltip.xml

@@ -86,6 +86,7 @@
        </getter>
      </property>
 
+     <field name="_buddy">null</field>
      <property name="buddy" onget="return this._buddy;">
        <setter>
          <![CDATA[
@@ -102,6 +103,7 @@
        </setter>
      </property>
 
+     <field name="_contact">null</field>
      <property name="contact" onget="return this._contact;">
        <setter>
          <![CDATA[
@@ -131,6 +133,7 @@
         ]]></body>
       </method>
 
+     <field name="_elt">null</field>
      <property name="elt">
        <getter>
          <![CDATA[