fix #56, about missing error check.

Author: ktrysmt

client.go

@@ -11,14 +11,15 @@ import (
 	"strconv"
 	"strings"
 
+	"bytes"
+	"io"
+	"mime/multipart"
+	"os"
+
 	"golang.org/x/net/context"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/bitbucket"
 	"golang.org/x/oauth2/clientcredentials"
-	"bytes"
-	"mime/multipart"
-	"io"
-	"os"
 )
 
 const DEFAULT_PAGE_LENGTH = 10
@@ -31,7 +32,7 @@ type Client struct {
 	Repositories *Repositories
 	Pagelen      uint64
 
-	HttpClient 	 *http.Client
+	HttpClient *http.Client
 }
 
 type auth struct {
@@ -130,7 +131,7 @@ func injectClient(a *auth) *Client {
 		Diff:               &Diff{c: c},
 		BranchRestrictions: &BranchRestrictions{c: c},
 		Webhooks:           &Webhooks{c: c},
-		Downloads:			&Downloads{c: c},
+		Downloads:          &Downloads{c: c},
 	}
 	c.Users = &Users{c: c}
 	c.User = &User{c: c}
@@ -167,6 +168,9 @@ func (c *Client) execute(method string, urlStr string, text string) (interface{}
 
 	c.authenticateRequest(req)
 	result, err := c.doRequest(req, false)
+	if err != nil {
+		return nil, err
+	}
 
 	//autopaginate.
 	resultMap, isMap := result.(map[string]interface{})
@@ -221,7 +225,7 @@ func (c *Client) executeFileUpload(method string, urlStr string, filePath string
 
 	var fw io.Writer
 	if fw, err = w.CreateFormFile("files", fileName); err != nil {
-		return nil , err
+		return nil, err
 	}
 
 	if _, err = io.Copy(fw, fileReader); err != nil {
@@ -245,7 +249,7 @@ func (c *Client) executeFileUpload(method string, urlStr string, filePath string
 
 }
 
-func (c *Client) authenticateRequest(req *http.Request){
+func (c *Client) authenticateRequest(req *http.Request) {
 	if c.Auth.bearerToken != "" {
 		req.Header.Set("Authorization", "Bearer "+c.Auth.bearerToken)
 	}
@@ -258,8 +262,7 @@ func (c *Client) authenticateRequest(req *http.Request){
 	return
 }
 
-
-func (c *Client) doRequest(req *http.Request, emptyResponse bool) (interface{}, error){
+func (c *Client) doRequest(req *http.Request, emptyResponse bool) (interface{}, error) {
 
 	resp, err := c.HttpClient.Do(req)
 	if err != nil {
@@ -295,7 +298,6 @@ func (c *Client) doRequest(req *http.Request, emptyResponse bool) (interface{},
 	return result, nil
 }
 
-
 func (c *Client) requestUrl(template string, args ...interface{}) string {
 
 	if len(args) == 1 && args[0] == "" {