added response check for swagger 2.0/1.2 client

lib/swagger-client.js

@@ -184,6 +184,7 @@ var SwaggerClient = function(url, options) {
   this.basePath = null;
   this.authorizations = null;
   this.authorizationScheme = null;
+  this.isValid = false;
   this.info = null;
   this.useJQuery = false;
 
@@ -236,6 +237,11 @@ SwaggerClient.prototype.build = function() {
         if(responseObj.swagger && responseObj.swagger === 2.0) {
           self.swaggerVersion = responseObj.swagger;
           self.buildFromSpec(responseObj);
+          self.isValid = true;
+        }
+        else {
+          self.isValid = false;
+          self.failure()
         }
       }
     }

lib/swagger.js

@@ -99,6 +99,7 @@ var SwaggerApi = function(url, options) {
   this.info = null;
   this.useJQuery = false;
   this.modelsArray = [];
+  this.isValid;
 
   options = (options||{});
   if (url)
@@ -213,6 +214,7 @@ SwaggerApi.prototype.buildFromSpec = function(response) {
       this.apisArray.push(res);
     }
   }
+  this.isValid = true;
   if (this.success) {
     this.success();
   }
@@ -260,6 +262,7 @@ SwaggerApi.prototype.buildFrom1_1Spec = function(response) {
       this.apisArray.push(res);
     }
   }
+  this.isValid = true;
   if (this.success) {
     this.success();
   }