Revert "Improve error when user doesn't have a wallet (#2231)"

This reverts commit 7a5e604.

Author: michaelsproul

account_manager/src/validator/create.rs

@@ -137,18 +137,6 @@ pub fn cli_run<T: EthSpec>(
     let count: Option<usize> = clap_utils::parse_optional(matches, COUNT_FLAG)?;
     let at_most: Option<usize> = clap_utils::parse_optional(matches, AT_MOST_FLAG)?;
 
-    // The command will always fail if the wallet dir does not exist.
-    if !wallet_base_dir.exists() {
-        return Err(format!(
-            "No wallet directory at {:?}. Use the `lighthouse --network {} {} {} {}` command to create a wallet",
-            wallet_base_dir,
-            matches.value_of("network").unwrap_or("<NETWORK>"),
-            crate::CMD,
-            crate::wallet::CMD,
-            crate::wallet::create::CMD
-        ));
-    }
-
     ensure_dir_exists(&validator_dir)?;
     ensure_dir_exists(&secrets_dir)?;