Remove redundant empty checks for required plugin argument

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

Author: Copilot

src/Plugin_Command.php

@@ -1406,9 +1406,9 @@ public function is_active( $args, $assoc_args ) {
 				// Check if the input matches the plugin file in various ways
 				// This mirrors the logic in WP_CLI\Fetchers\Plugin::get()
 				if (
-					( ! empty( $input_name ) && "$input_name.php" === $plugin_file ) ||
-					( ! empty( $input_name ) && $plugin_file === $input_name ) ||
-					( ! empty( $input_name ) && dirname( $plugin_file ) === $input_name && '.' !== $input_name )
+					"$input_name.php" === $plugin_file ||
+					$plugin_file === $input_name ||
+					( dirname( $plugin_file ) === $input_name && '.' !== $input_name )
 				) {
 					$found_in_active = $plugin_file;
 					break;