patch 8.2.4670: memory allocation failures for new tab page not tested

Problem:    Memory allocation failures for new tab page not tested.
Solution:   Add tests with failing memory allocation. (Yegappan Lakshmanan,
            closes #10067)
diff --git a/src/blob.c b/src/blob.c
index afc2de6..0d88c75 100644
--- a/src/blob.c
+++ b/src/blob.c
@@ -22,7 +22,7 @@
     blob_T *
 blob_alloc(void)
 {
-    blob_T *blob = ALLOC_CLEAR_ONE(blob_T);
+    blob_T *blob = ALLOC_CLEAR_ONE_ID(blob_T, aid_blob_alloc);
 
     if (blob != NULL)
 	ga_init2(&blob->bv_ga, 1, 100);