Fix problem with draw options list

When draw handle registered only for icon (not for drawing),
do not return opts list. Use non-empty opts list to detect if
object can be drawn

Author: linev

scripts/JSRootPainter.jquery.js

@@ -491,15 +491,17 @@
          if (fileprop != null) {
             var opts = JSROOT.getDrawOptions(hitem._kind, 'nosame');
 
-            menu.addDrawMenu("Draw", opts, function(arg) { painter.display(itemname, arg); });
+            if (opts!=null)
+               menu.addDrawMenu("Draw", opts, function(arg) { painter.display(itemname, arg); });
 
             var filepath = qualifyURL(fileprop.fileurl);
             if (filepath.indexOf(JSROOT.source_dir) == 0)
                filepath = filepath.slice(JSROOT.source_dir.length);
 
-            menu.addDrawMenu("Draw in new window", opts, function(arg) {
-               window.open(JSROOT.source_dir + "index.htm?nobrowser&file=" + filepath + "&item=" + fileprop.itemname+"&opt="+arg);
-            });
+            if (opts!=null)
+               menu.addDrawMenu("Draw in new window", opts, function(arg) {
+                  window.open(JSROOT.source_dir + "index.htm?nobrowser&file=" + filepath + "&item=" + fileprop.itemname+"&opt="+arg);
+               });
          }
 
          if (menu.size()>0) {

scripts/JSRootPainter.js

@@ -9693,7 +9693,7 @@
       var allopts = null, isany = false;
       for (var cnt=0;cnt<1000;cnt++) {
          var h = JSROOT.getDrawHandle(kind, cnt);
-         if (h==null) break;
+         if ((h==null) || !('func' in h)) break;
          isany = true;
          if (! ('opt' in h)) continue;
          var opts = h.opt.split(';');
@@ -9715,7 +9715,7 @@
    }
 
    JSROOT.canDraw = function(classname) {
-      return JSROOT.getDrawHandle("ROOT." + classname) != null;
+      return JSROOT.getDrawOptions("ROOT." + classname) != null;
    }
 
    /** @fn JSROOT.draw(divid, obj, opt)