lok::Document::initializeForRendering(): handle lack of lok_init()

Normally lok_init() sets the component context, but not e.g. during unit
testing.

Change-Id: If3760f31af2e4b870f65e5aa7557607e8b6a1114
(cherry picked from commit de1f156c)

desktop/source/lib/init.cxx

@@ -573,6 +573,14 @@ static void doc_iniUnoCommands ()
         return;
     }
 
+    if (!xContext.is())
+        xContext = comphelper::getProcessComponentContext();
+    if (!xContext.is())
+    {
+        SAL_WARN("lok", "iniUnoCommands: Component context is not available");
+        return;
+    }
+
     SfxSlotPool& rSlotPool = SfxSlotPool::GetSlotPool(pViewFrame);
     uno::Reference<util::XURLTransformer> xParser(util::URLTransformer::create(xContext));