fix bug in help command

Cargo.lock

@@ -205,7 +205,7 @@ dependencies = [
 
 [[package]]
 name = "ipass"
-version = "0.4.2"
+version = "0.4.3"
 dependencies = [
  "ip_lib",
  "rpassword",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "ipass"
-version = "0.4.2"
+version = "0.4.3"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

src/main.rs

@@ -135,7 +135,11 @@ fn help_message(args: &Vec<String>) {
         return;
     }
 
-    println!("{} {}", &args[2], &help_messages[&args[2]])    
+    if help_messages.contains_key(&args[2]) {
+        println!("{} {}", &args[2], &help_messages[&args[2]]) 
+    } else {
+        println!("Unknown option {}",&args[2])
+    }
 }
 
 fn list() {