Don't try and run drawing tools in ModEdit with no module selected.

Fixes: lp:1836673
* https://bugs.launchpad.net/kicad/+bug/1836673

pcbnew/tools/drawing_tool.cpp

@@ -1357,6 +1357,9 @@ bool DRAWING_TOOL::getSourceZoneForAction( ZONE_MODE aMode, ZONE_CONTAINER*& aZo
 
 int DRAWING_TOOL::DrawZone( const TOOL_EVENT& aEvent )
 {
+    if( m_editModules && !m_frame->GetModel() )
+        return 0;
+
     ZONE_MODE zoneMode = aEvent.Parameter<ZONE_MODE>();
     MODE      drawMode = MODE::ZONE;
 

pcbnew/tools/footprint_editor_tools.cpp

@@ -285,6 +285,9 @@ int MODULE_EDITOR_TOOLS::DefaultPadProperties( const TOOL_EVENT& aEvent )
 
 int MODULE_EDITOR_TOOLS::PlacePad( const TOOL_EVENT& aEvent )
 {
+    if( !m_frame->GetBoard()->GetFirstModule() )
+        return 0;
+
     struct PAD_PLACER : public INTERACTIVE_PLACER_BASE
     {
         std::unique_ptr<BOARD_ITEM> CreateItem() override

pcbnew/tools/pcb_tool_base.cpp

@@ -61,6 +61,7 @@ void PCB_TOOL_BASE::doInteractiveItemPlacement( const std::string& aTool,
 
     auto makeNewItem = [&] ( VECTOR2I aPosition )
     {
+        if( frame()->GetModel() )
             newItem = aPlacer->CreateItem();
 
         if( newItem )

pcbnew/tools/pcbnew_control.cpp

@@ -447,6 +447,9 @@ int PCBNEW_CONTROL::GridSetOrigin( const TOOL_EVENT& aEvent )
     }
     else
     {
+        if( m_editModules && !getEditFrame<PCB_BASE_EDIT_FRAME>()->GetModel() )
+            return 0;
+
         std::string         tool = aEvent.GetCommandStr().get();
         PCBNEW_PICKER_TOOL* picker = m_toolMgr->GetTool<PCBNEW_PICKER_TOOL>();
 
@@ -481,6 +484,9 @@ int PCBNEW_CONTROL::GridResetOrigin( const TOOL_EVENT& aEvent )
 
 int PCBNEW_CONTROL::DeleteItemCursor( const TOOL_EVENT& aEvent )
 {
+    if( m_editModules && !m_frame->GetBoard()->GetFirstModule() )
+        return 0;
+
     std::string         tool = aEvent.GetCommandStr().get();
     PCBNEW_PICKER_TOOL* picker = m_toolMgr->GetTool<PCBNEW_PICKER_TOOL>();