Fix - ignore scatter palette in hist painter

After drawing palette was disabled while no axisz option
configured for the histogram

modules/hist2d/THistPainter.mjs

@@ -41,7 +41,8 @@ class THistDrawOptions {
               Render3D: constants.Render3D.Default,
               FrontBox: true, BackBox: true,
               need_fillcol: false,
-              minimum: kNoZoom, maximum: kNoZoom, ymin: 0, ymax: 0, cutg: null, IgnoreMainScale: false });
+              minimum: kNoZoom, maximum: kNoZoom, ymin: 0, ymax: 0, cutg: null,
+              IgnoreMainScale: false, IgnorePalette: false });
    }
 
    isCartesian() { return this.System === kCARTESIAN; }
@@ -106,6 +107,9 @@ class THistDrawOptions {
       d.check('USE_PAD_PALETTE');
       d.check('USE_PAD_STATS');
 
+      if (d.check('IGNORE_PALETTE'))
+         this.IgnorePalette = true;
+
       if (d.check('PAL', true))
          this.Palette = d.partAsInt();
       // this is zooming of histo content
@@ -2010,6 +2014,10 @@ class THistPainter extends ObjectPainter {
    /** @summary draw color palette
      * @return {Promise} when done */
    async drawColorPalette(enabled, postpone_draw, can_move) {
+      // in special cases like scatter palette drawing is ignored
+      if (this.options.IgnorePalette)
+         return null;
+
       // only when create new palette, one could change frame size
       const mp = this.getMainPainter(),
             pp = this.getPadPainter();

modules/hist2d/TScatterPainter.mjs

@@ -24,7 +24,7 @@ class TScatterPainter extends TGraphPainter {
     * @private */
    async drawAxisHisto() {
       const histo = this.createHistogram();
-      return TH2Painter.draw(this.getDom(), histo, this.options.Axis);
+      return TH2Painter.draw(this.getDom(), histo, this.options.Axis + ';IGNORE_PALETTE');
    }
 
   /** @summary Provide palette, create if necessary