Fix menu command execution in TGraph

Author: linev

modules/hist2d/TGraphPainter.mjs

@@ -1296,10 +1296,10 @@ class TGraphPainter extends ObjectPainter {
       if ((method.fName == 'RemovePoint') || (method.fName == 'InsertPoint')) {
          if (!canp || canp._readonly) return true; // ignore function
 
-         let hint = this.extractTooltip(pnt);
+         let pnt = isFunc(pmain?.getLastEventPos) ? pmain.getLastEventPos() : null,
+             hint = this.extractTooltip(pnt);
 
          if (method.fName == 'InsertPoint') {
-            let pnt = isFunc(pmain.getLastEventPos) ? pmain.getLastEventPos() : null;
             if (pnt) {
                let funcs = pmain.getGrFuncs(this.options.second_x, this.options.second_y),
                    userx = funcs.revertAxis('x', pnt.x) ?? 0,