fix: update to return false for empty strings

---
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---

Author: Planeshifter

lib/node_modules/@stdlib/assert/is-arrow-function/README.md

@@ -32,7 +32,7 @@ var isArrowFunction = require( '@stdlib/assert/is-arrow-function' );
 
 #### isArrowFunction( value )
 
-Tests if a `value` is a an [`arrow function`][mdn-arrow-function] such as `( a, b ) => a + b`, `x => x`, or `( x ) => { return x*x; }`.
+Tests if a `value` is an [`arrow function`][mdn-arrow-function] such as `( a, b ) => a + b`, `x => x`, or `( x ) => { return x*x; }`.
 
 <!-- eslint-disable func-style, no-restricted-syntax, node/no-unsupported-features/es-syntax -->
 

lib/node_modules/@stdlib/assert/is-duration-string/lib/main.js

@@ -61,7 +61,7 @@ var RE_DURATION_STRING = /^(?:\d+d)?(?:\d+h)?(?:\d+m)?(?:\d+s)?(?:\d+ms)?$/i;
 * // returns true
 */
 function isDurationString( value ) {
-	if ( !isString( value ) ) {
+	if ( !isString( value ) || value.length === 0 ) {
 		return false;
 	}
 	return RE_DURATION_STRING.test( value );

lib/node_modules/@stdlib/assert/is-duration-string/test/test.js

@@ -61,6 +61,7 @@ tape( 'the function returns `false` if provided a non-duration string', function
 	var i;
 
 	values = [
+		'',
 		'5',
 		'beep',
 		'1',