coverity#704792 Dereference after null check

Change-Id: Ie6f3174266dfa42a1eff81df45fc408656d4fbd9

sfx2/source/dialog/dinfdlg.cxx

@@ -2101,10 +2101,14 @@ bool SfxCustomPropertiesPage::FillItemSet( SfxItemSet& rSet )
     }
 
     bModified = true; //!!!
+
+    if (pInfo)
+    {
         if ( bModified )
             rSet.Put( *pInfo );
         if ( bMustDelete )
             delete pInfo;
+    }
     return bModified;
 }