added erroring functions for swarm when no provider is set

Author: frozeman

dist/web3.min.js

@@ -8,7 +8,7 @@
     "main": "src/index.js",
     "dependencies": {
         "got": "7.1.0",
-        "swarm-js": "0.1.35",
+        "swarm-js": "0.1.37",
         "underscore": "1.8.3"
     }
 }

packages/web3-bzz/package.json

@@ -65,6 +65,13 @@ Bzz.prototype.setProvider = function(provider) {
         this.currentProvider = provider;
     } else {
         this.currentProvider = null;
+
+        var noProviderError = new Error('No provider set, please set one using bzz.setProvider().');
+
+        this.download = this.upload = this.isAvailable = function(){
+            throw noProviderError;
+        };
+
         return false;
     }