Replace error throwing with logger warning when publicPath is not absolute

Author: andyexeter

lib/WebpackConfig.js

@@ -125,9 +125,9 @@ class WebpackConfig {
     setPublicPath(publicPath) {
         if (publicPath.includes('://') === false && publicPath.indexOf('/') !== 0) {
             // technically, not starting with "/" is legal, but not
-            // what you want in most cases. Let's not let the user make
-            // a mistake (and we can always change this later).
-            throw new Error('The value passed to setPublicPath() must start with "/" or be a full URL (http://...)');
+            // what you want in most cases. Let's warn the user that
+            // they might be making a mistake.
+            logger.warning('The value passed to setPublicPath() should usually start with "/" or be a full URL (http://...)');
         }
 
         // guarantee a single trailing slash