patch 9.0.0994: tests for empty prop type name fail

Problem:    Tests for empty prop type name fail.
Solution:   Correct the error number.
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index d85d064..d0f49dd 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -3171,14 +3171,14 @@
   v9.CheckDefAndScriptFailure(['prop_type_delete({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
   v9.CheckDefAndScriptFailure(['prop_type_delete({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
   v9.CheckDefAndScriptFailure(['prop_type_delete("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
-  assert_fails("prop_type_delete('')", 'E474:')
+  assert_fails("prop_type_delete('')", 'E475:')
 enddef
 
 def Test_prop_type_get()
   v9.CheckDefAndScriptFailure(['prop_type_get({"a": 10})'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
   v9.CheckDefAndScriptFailure(['prop_type_get({"a": 10}, "b")'], ['E1013: Argument 1: type mismatch, expected string but got dict<number>', 'E1174: String required for argument 1'])
   v9.CheckDefAndScriptFailure(['prop_type_get("a", "b")'], ['E1013: Argument 2: type mismatch, expected dict<any> but got string', 'E1206: Dictionary required for argument 2'])
-  assert_fails("prop_type_get('')", 'E474:')
+  assert_fails("prop_type_get('')", 'E475:')
 enddef
 
 def Test_prop_type_list()
diff --git a/src/version.c b/src/version.c
index 9fbed7c..6b4f103 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    994,
+/**/
     993,
 /**/
     992,