Fixed kdvi "TQApplication::notify: Unexpected null receiver" warning message at startup. This resolves bug 1891.

diff --git a/kviewshell/kviewpart.cpp b/kviewshell/kviewpart.cpp
index cc8f8b2..a66150d 100644
--- a/kviewshell/kviewpart.cpp
+++ b/kviewshell/kviewpart.cpp
@@ -1471,15 +1471,19 @@
 
 void KViewPart::partActivateEvent( KParts::PartActivateEvent *ev )
 {
-  TQApplication::sendEvent( multiPage, ev );
+  if (!multiPage.isNull())
+  {
+    TQApplication::sendEvent( multiPage, ev );
+  }
 }
-
 
 void KViewPart::guiActivateEvent( KParts::GUIActivateEvent *ev )
 {
-  TQApplication::sendEvent( multiPage, ev );
+  if (!multiPage.isNull())
+  {
+    TQApplication::sendEvent( multiPage, ev );
+  }
 }
-
 
 void KViewPart::slotEnableMoveTool(bool enable)
 {