Address comments

modules/webgl/src/classes/program.js

@@ -152,8 +152,9 @@ export default class Program extends Resource {
       // Now that all uniforms have been updated, check if any texture
       // in the uniforms is not yet initialized, then we don't draw
       !this._areTexturesRenderable() ||
-      // Avoid WebGL warning when vertexCount is 0
-      vertexCount <= 0
+      // Avoid WebGL draw call when not rendering any data
+      vertexCount === 0 ||
+      (isInstanced && instanceCount === 0)
     ) {
       return false;
     }

modules/webgl/test/classes/program.spec.js

@@ -68,6 +68,9 @@ test('WebGL#Program draw', t => {
   didDraw = program.draw({vertexArray, vertexCount: 0});
   t.notOk(didDraw, 'Program draw succesfully skipped');
 
+  didDraw = program.draw({vertexArray, vertexCount: 3, instanceCount: 0, isInstanced: true});
+  t.notOk(didDraw, 'Instanced Program draw succesfully skipped');
+
   t.end();
 });