Webgl renderer / hide shader compile errors

Turns out there are sometimes errors that will not prevent the
shader from functioning normally. As such, it is not possible
to simply throw when there are errors/warnings.

Since we are not logging to the console, these errors will have to stay hidden
unless the user requests them explicitly.

src/ol/renderer/webgl/PointsLayer.js

@@ -143,10 +143,6 @@ class WebGLPointsLayerRenderer extends WebGLLayerRenderer {
       options.vertexShader
     );
 
-    if (this.getShaderCompileErrors()) {
-      throw new Error(this.getShaderCompileErrors());
-    }
-
     /**
      * @type {boolean}
      * @private
@@ -158,10 +154,6 @@ class WebGLPointsLayerRenderer extends WebGLLayerRenderer {
       options.hitVertexShader
     );
 
-    if (this.getShaderCompileErrors()) {
-      throw new Error(this.getShaderCompileErrors());
-    }
-
     const customAttributes = options.attributes ?
       options.attributes.map(function(attribute) {
         return {