Pref appindicator only if lib installed

Author: Ximi1970

src/chrome/content/options.js

@@ -40,7 +40,7 @@ var firetrayUIOptions = {
       ]);
     } else if (firetray.AppIndicator) {
       this.hideUnsupportedOptions([
-        'app_icon_default', 
+        'app_icon_default',
         'newmail_icon_names'
       ]);
     } else {
@@ -66,6 +66,12 @@ var firetrayUIOptions = {
       this.removePrefPane("pref-pane-chat");
     };
 
+    if (!firetray.Handler.canAppind) {
+      this.hideUnsupportedOptions([
+        'ui_use_appindicator_icon'
+      ]);
+    }
+    
     window.sizeToContent();
   },
 

src/modules/FiretrayHandler.jsm

@@ -38,6 +38,7 @@ firetray.Handler = {
   appHasChat: false,
   appStarted: false,
   useAppind: false,             // initialized in StatusIcon
+  canAppind: false,             // initialized in StatusIcon
   windows: {},
   get windowsCount() {return Object.keys(this.windows).length;},
   get visibleWindowsCount() {

src/modules/linux/FiretrayStatusIcon.jsm

@@ -29,6 +29,7 @@ firetray.StatusIcon = {
   prefNewMailIconNames: null,
   defaultAppIconName: null,
   defaultNewMailIconName: null,
+  canAppind: false,
 
   init: function() {
     this.defineIconNames();
@@ -110,11 +111,11 @@ firetray.StatusIcon = {
       return false;
     }
 
-    let canAppIndicator = (appind.available() &&
+    this.canAppind = (appind.available() &&
                            this.dbusNotificationWatcherReady());
 
     return (firetray.Utils.prefService.getBoolPref('with_appindicator') &&
-            canAppIndicator && isAppindDesktop);
+            this.canAppind && isAppindDesktop);
   },
 
   getDesktop: function() {
@@ -223,6 +224,7 @@ firetray.StatusIcon = {
 
 
 firetray.Handler.useAppind = firetray.StatusIcon.appindEnable();
+firetray.Handler.canAppind = firetray.StatusIcon.canAppind;
 
 firetray.Handler.setIconTooltipDefault = function() {
   if (!this.app.name)