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

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

(cherry picked from commit 02eb1d2c62)

include/base_struct.h

@@ -257,6 +257,14 @@ public:
     void ClearFlags( STATUS_FLAGS aMask = EDA_ITEM_ALL_FLAGS ) { m_Flags &= ~aMask; }
     STATUS_FLAGS GetFlags() const { return m_Flags; }
 
+    STATUS_FLAGS GetEditFlags() const
+    {
+        int mask = EDA_ITEM_ALL_FLAGS - ( SELECTED | SELECTEDNODE | HIGHLIGHTED | BRIGHTENED |
+                                          STARTPOINT | ENDPOINT |
+                                          BEGIN_ONPAD | END_ONPAD | DP_COUPLED );
+        return m_Flags & mask;
+    }
+
     /**
      * Function IsType
      * Checks whether the item is one of the listed types

pcbnew/tools/drawing_tool.cpp

@@ -1378,6 +1378,9 @@ bool DRAWING_TOOL::getSourceZoneForAction( ZONE_MODE aMode, ZONE_CONTAINER*& aZo
 
 int DRAWING_TOOL::drawZone( bool aKeepout, ZONE_MODE aMode )
 {
+    if( m_editModules && !m_frame->GetModel() )
+        return 0;
+
     // get a source zone, if we need one. We need it for:
     // ZONE_MODE::CUTOUT (adding a hole to the source zone)
     // ZONE_MODE::SIMILAR (creating a new zone using settings of source zone

pcbnew/tools/footprint_editor_tools.cpp

@@ -99,6 +99,9 @@ void MODULE_EDITOR_TOOLS::Reset( RESET_REASON aReason )
 
 int MODULE_EDITOR_TOOLS::PlacePad( const TOOL_EVENT& aEvent )
 {
+    if( !frame()->GetBoard()->m_Modules )
+        return 0;
+
     struct PAD_PLACER : public INTERACTIVE_PLACER_BASE
     {
         std::unique_ptr<BOARD_ITEM> CreateItem() override
@@ -129,8 +132,6 @@ int MODULE_EDITOR_TOOLS::PlacePad( const TOOL_EVENT& aEvent )
 
     frame()->SetToolID( ID_MODEDIT_PAD_TOOL, wxCURSOR_PENCIL, _( "Add pads" ) );
 
-    wxASSERT( board()->m_Modules );
-
     doInteractiveItemPlacement( &placer,  _( "Place pad" ), IPO_REPEAT | IPO_SINGLE_CLICK | IPO_ROTATE | IPO_FLIP );
 
     frame()->SetNoToolSelected();

pcbnew/tools/pcb_tool.cpp

@@ -65,6 +65,7 @@ void PCB_TOOL::doInteractiveItemPlacement( INTERACTIVE_PLACER_BASE* aPlacer,
     {
         VECTOR2I cursorPos = controls()->GetCursorPosition();
 
+        if( frame()->GetModel() )
             newItem = aPlacer->CreateItem();
 
         if( newItem )

pcbnew/tools/pcbnew_control.cpp

@@ -594,6 +594,9 @@ int PCBNEW_CONTROL::GridSetOrigin( const TOOL_EVENT& aEvent )
     }
     else
     {
+        if( m_editModules && !getEditFrame<PCB_BASE_EDIT_FRAME>()->GetModel() )
+            return 0;
+
         Activate();
 
         PICKER_TOOL* picker = m_toolMgr->GetTool<PICKER_TOOL>();
@@ -683,6 +686,9 @@ static bool deleteItem( TOOL_MANAGER* aToolMgr, const VECTOR2D& aPosition )
 
 int PCBNEW_CONTROL::DeleteItemCursor( const TOOL_EVENT& aEvent )
 {
+    if( m_editModules && !m_frame->GetBoard()->m_Modules )
+        return 0;
+
     Activate();
 
     PICKER_TOOL* picker = m_toolMgr->GetTool<PICKER_TOOL>();