patch 8.0.0159: crash on startup when updating tabline

Problem:    Using a NULL pointer when using feedkeys() to trigger drawing a
            tabline.
Solution:   Skip drawing a tabline if TabPageIdxs is NULL. (Dominique Pelle)
            Also fix recursing into getcmdline() from the cmd window.
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 5d098cc..cf99ae2 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -772,7 +772,9 @@
 		/*
 		 * Open a window to edit the command line (and history).
 		 */
+		save_cmdline(&save_ccline);
 		c = ex_window();
+		restore_cmdline(&save_ccline);
 		some_key_typed = TRUE;
 	    }
 	}