fallback to standard ssh when no key is found in store

agent.go

@@ -85,11 +85,7 @@ func startSSH(storePath string, args []string) {
 
 	if host != "" {
 		pemData, err := findKey(storePath, user, host)
-		if err != nil {
-			fmt.Println("Error:", err)
-			os.Exit(1)
-		}
-
+		if err == nil {
 			targetName := host
 			if user != "" {
 				targetName = user + "@" + host
@@ -110,6 +106,7 @@ func startSSH(storePath string, args []string) {
 			}
 			env = newEnv
 		}
+	}
 
 	sshPath, err := exec.LookPath("ssh")
 	if err != nil {