build: remove extra empty line when imports are present

Author: Planeshifter

lib/node_modules/@stdlib/_tools/scripts/create_namespace_types.js

@@ -121,11 +121,12 @@ function createDefinitionFile( ns, imports, properties, description ) {
 		'',
 		'// TypeScript Version: 4.1',
 		'',
-		'/* eslint-disable max-lines' + ( ( properties.length === 0 ) ? ', @typescript-eslint/no-empty-interface' : '' ) + ' */',
-		''
+		'/* eslint-disable max-lines' + ( ( properties.length === 0 ) ? ', @typescript-eslint/no-empty-interface' : '' ) + ' */'
 	];
 	if ( imports.length > 0 ) {
 		lines.push( '', imports.join( '\n' ), '' );
+	} else {
+		lines.push( '' );
 	}
 	lines = lines.concat([
 		'/**',