Fix error handling

ticket https://code.vereign.com/code/dashboard/issues/447

main.go

@@ -149,7 +149,7 @@ func buildViamAPI() string {
 			methodStr := splits[len(splits)-1]
 
 			result += "ViamAPI.prototype." + packageStr + strings.Title(methodStr) + " = function(config, data) {\n" +
-				"    return axios.post(window.API_HOST + '" + packageStr + "/" + methodStr + "', data, merge({}, this.config, config));\n" +
+				"    return axios.post(window.API_HOST + '" + packageStr + "/" + methodStr + "', data || {}, merge({}, this.config, config));\n" +
 				"};\n\n"
 		}
 	}