disallow blank encryption passkeys (#186)

fixes #185

src/accountmanager.rs

@@ -86,6 +86,11 @@ impl Manifest {
 
 	/// Tells the manifest to keep track of the encryption passkey, and use it for encryption when loading or saving accounts.
 	pub fn submit_passkey(&mut self, passkey: Option<String>) {
+		if let Some(p) = passkey.as_ref() {
+			if p.is_empty() {
+				panic!("Encryption passkey cannot be empty");
+			}
+		}
 		if passkey.is_some() {
 			debug!("passkey was submitted to manifest");
 		} else {

src/main.rs

@@ -641,6 +641,12 @@ fn do_subcmd_encrypt(
 		let mut passkey;
 		loop {
 			passkey = rpassword::prompt_password_stdout("Enter encryption passkey: ").ok();
+			if let Some(p) = passkey.as_ref() {
+				if p.is_empty() {
+					error!("Passkey cannot be empty, try again.");
+					continue;
+				}
+			}
 			let passkey_confirm =
 				rpassword::prompt_password_stdout("Confirm encryption passkey: ").ok();
 			if passkey == passkey_confirm {