#5864: Fix crashes when opening the mission info edit dialog.

Some tokens were unsupported by the parser, and one windowDef has been removed from the TDM main menu.

plugins/dm.editing/MissionInfoGuiView.cpp

@@ -89,7 +89,11 @@ void DarkmodTxtGuiView::updateGuiState()
 	gui->findWindowDef("modCompletedValue")->text.setValue("2017-11-26");
 	gui->findWindowDef("modSizeTitle")->text.setValue("Space used:");
 	gui->findWindowDef("modSizeValue")->text.setValue("123 MB");
-	gui->findWindowDef("modSizeEraseFromDiskAction")->text.setValue("[Erase from disk]");
+
+    if (gui->findWindowDef("modSizeEraseFromDiskAction"))
+    {
+	    gui->findWindowDef("modSizeEraseFromDiskAction")->text.setValue("[Erase from disk]");
+    }
 
 	gui->findWindowDef("modLoadN")->text.setValue("Install Mission");
 	gui->findWindowDef("modLoadH")->text.setValue("Install Mission");

plugins/dm.gui/gui/GuiWindowDef.cpp

@@ -326,7 +326,7 @@ void GuiWindowDef::constructFromTokens(parser::DefTokeniser& tokeniser)
 
 			// TODO
 		}
-		else if (token == "onesc")
+		else if (token == "onesc" || token == "onactivate")
 		{
 			GuiScriptPtr script(new GuiScript(*this));
 			script->constructFromTokens(tokeniser);
@@ -425,6 +425,10 @@ void GuiWindowDef::constructFromTokens(parser::DefTokeniser& tokeniser)
 			rWarning() << "'choiceType' token encountered in windowDef block in " << name << std::endl;
 			tokeniser.nextToken(); // the choicetype value
 		}
+        else if (token == "matscalex" || token == "matscaley")
+        {
+            tokeniser.nextToken(); // value
+        }
 		else if (token == "}")
 		{
 			break;