Remove extraneous serialized. Fix init error propagation.

src/formats.js

@@ -35,7 +35,7 @@ var json = _.JSON = $.Class({
 	extends: _.Base,
 	static: {
 		parse: serialized => Promise.resolve(serialized && (serialized + "").trim() ? 
-			JSON.parse((serialized + "").trim()) : null),
+			JSON.parse(serialized) : null),
 		stringify: data => Promise.resolve(Mavo.toJSON(data)),
 		extensions: [".json", ".jsonld"]
 	}

src/mavo.js

@@ -475,19 +475,21 @@ var _ = self.Mavo = $.Class({
 
 		return backend.ready.then(() => backend.load())
 		.then(data => {
-			// if we get null data try to load from init
+			// if we get null data throw an error
 			return data === null? Promise.reject(new Error('backend loaded null data')) : data;
 		})
 		.catch(err => {
-			// if we get an error try to load from init
-			// Try again with init
+			// if there is an init backend then return null and don't propagate the error
 			if (this.init && this.init != backend) {
 				backend = this.init;
-				return this.init.ready.then(() => this.init.load());
+				return null;
 			}
 
 			// No init, propagate error
-			return Promise.reject(err);		
+			return Promise.reject(err);
+		}).then(data => {
+			// if data is null we have an init backend so try to load from the init backend
+			return data === null ? this.init.ready.then(() => this.init.load()) : data;
 		})
 		.catch(err => {
 			if (err) {