Add better gh pr view message

api/queries_pr.go

@@ -368,7 +368,7 @@ func PullRequestForBranch(client *Client, ghRepo Repo, branch string) (*PullRequ
 		}
 	}
 
-	return nil, fmt.Errorf("no open pull requests found for branch %q", branch)
+	return nil, nil
 }
 
 func CreatePullRequest(client *Client, ghRepo Repo, params map[string]interface{}) (*PullRequest, error) {

command/pr.go

@@ -271,6 +271,14 @@ func prView(cmd *cobra.Command, args []string) error {
 			if err != nil {
 				return err
 			}
+
+			if pr == nil {
+				branch, err := ctx.Branch()
+				if err != nil {
+					return err
+				}
+				return fmt.Errorf("no open pull requests found for branch %q. To open a specific PR use a PR number as an argument", branch)
+			}
 			openURL = pr.URL
 		}
 	}