Allow an app to call SetFont on a PS DC without assertion

(should be possible to use SetFont before StartDoc).


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26057 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/dcpsg.cpp

@@ -1011,6 +1011,10 @@ void wxPostScriptDC::SetFont( const wxFont& font )
         }
     }
 
+    // We may legitimately call SetFont before BeginDoc
+    if (!m_pstream)
+        return;
+    
     PsPrint( name );
     PsPrint( " reencodeISO def\n" );
     PsPrint( name );