Add test for empty statusText in HttpResponse and remove null test

Author: eafalkens

src/test/java/org/juv25d/http/HttpResponseTest.java

@@ -25,8 +25,9 @@ void shouldReturnDefaultText() {
     }
 
     @Test
-    void shouldThrowExceptionWhenStatusTextIsNull() {
-        assertThrows(NullPointerException.class, () -> response.setStatusText(null));
+    void shouldAllowEmptyStatusText() {
+        response.setStatusText("");
+        assertEquals("", response.statusText());
     }
 
     @Test