update backend: ensure coding_ide_home exists

tanhe123 · tanhe123 · commit 452085752c9a · 2016-09-21T12:33:35.000+08:00
diff --git a/backend b/backend
@@ -1 +1 @@
-Subproject commit 0c19b67dfa810db0ac3d0d303dda688b91b337f4
+Subproject commit e7697091bd639560673101b55e32ed37c2cb5de9
