patch 8.2.0678: rare crash for popup menu

Problem:    Rare crash for popup menu.
Solution:   Check for NULL pointer. (Nobuhiro Takasaki, closes #6027)
diff --git a/src/popupmenu.c b/src/popupmenu.c
index b267ec5..d6993dc 100644
--- a/src/popupmenu.c
+++ b/src/popupmenu.c
@@ -60,9 +60,12 @@
     pum_extra_width = 0;
     for (i = 0; i < pum_size; ++i)
     {
-	w = vim_strsize(pum_array[i].pum_text);
-	if (pum_base_width < w)
-	    pum_base_width = w;
+	if (pum_array[i].pum_text != NULL)
+	{
+	    w = vim_strsize(pum_array[i].pum_text);
+	    if (pum_base_width < w)
+		pum_base_width = w;
+	}
 	if (pum_array[i].pum_kind != NULL)
 	{
 	    w = vim_strsize(pum_array[i].pum_kind) + 1;
diff --git a/src/version.c b/src/version.c
index 8f1539a..29763f7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    678,
+/**/
     677,
 /**/
     676,