Fix assertion warning message when no description is provided

Author: Girgias

ext/standard/assert.c

@@ -177,7 +177,7 @@ PHP_FUNCTION(assert)
 			zend_exception_error(EG(exception), E_ERROR);
 		}
 	} else if (ASSERTG(warning)) {
-		php_error_docref(NULL, E_WARNING, "%s failed", description_str ? ZSTR_VAL(description_str) : "Assertion failed");
+		php_error_docref(NULL, E_WARNING, "%s failed", description_str ? ZSTR_VAL(description_str) : "Assertion");
 	}
 
 	if (ASSERTG(bail)) {

ext/standard/tests/assert/assert_warnings.phpt

@@ -0,0 +1,13 @@
+--TEST--
+assert(): warnings with no descriptions.
+--INI--
+assert.active = 1
+assert.warning = 1
+assert.bail = 0
+assert.exception=0
+--FILE--
+<?php
+assert(0, null);
+?>
+--EXPECTF--
+Warning: assert(): Assertion failed in %s on line %d