WebGLRenderer: Added console.warn when unknown uniform type. See #3619.

src/renderers/WebGLRenderer.js

@@ -5652,6 +5652,10 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 				}
 
+			} else {
+
+				console.warn( 'THREE.WebGLRenderer: Unknown uniform type: ' + type );
+
 			}
 
 		}