patch 8.1.2076: crash when trying to put a terminal in a popup window

Problem:    Crash when trying to put a terminal buffer in a popup window.
Solution:   Check for NULL buffer.  Do not allow putting a terminal in a popup
            window.
diff --git a/src/version.c b/src/version.c
index f1c082b..4bf2106 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2076,
+/**/
     2075,
 /**/
     2074,