Fixed SEGV caused by dereferencing null pointer. This resolves issue #3.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

src/part/radialMap/widget.cpp

@@ -42,7 +42,15 @@ RadialMap::Widget::path() const
 KURL
 RadialMap::Widget::url( File const * const file ) const
 {
-   return KURL::fromPathOrURL( file ? file->fullPath() : m_tree->fullPath() );
+	if (file)
+	{
+    return KURL::fromPathOrURL(file->fullPath());
+	}
+	if (m_tree)
+	{
+    return KURL::fromPathOrURL(m_tree->fullPath());
+	}
+  return KURL::fromPathOrURL(TQString::null);
 }
 
 void