Adjust for empty key in PathUtils.getPath(String, String)

Author: garydgregory

src/main/java/org/apache/commons/io/file/PathUtils.java

@@ -1105,7 +1105,7 @@ private static Path getParent(final Path path) {
      * @since 2.21.0
      */
     public static Path getPath(final String key, final String defaultPath) {
-        final String property = System.getProperty(Objects.toString(key, defaultPath), defaultPath);
+        final String property = key != null && !key.isEmpty() ? System.getProperty(key, defaultPath) : defaultPath;
         return property != null ? Paths.get(property) : null;
     }
 

src/test/java/org/apache/commons/io/file/PathUtilsTest.java

@@ -361,6 +361,7 @@ void testGetPath() {
         assertEquals(value, PathUtils.getPath(invalidKey, value.toString()));
         assertNull(PathUtils.getPath(invalidKey, null));
         assertEquals(value, PathUtils.getPath(null, value.toString()));
+        assertEquals(value, PathUtils.getPath("", value.toString()));
     }
 
     @Test