be7d0e39daf1dccba6c281dd362c591b545f0490 Fix: Headers which used cols…

…pan with a single row would throw an error

DD-3026
https://datatables.net/forums/discussion/80146/
https://datatables.net/forums/discussion/80346/

e027f372c436a79d941e781218d6f65f4c8ede87 Merge branch 'master' of github.com:DataTables/DataTablesSrc

Sync to source repo @e027f372c436a79d941e781218d6f65f4c8ede87

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
     "last-tag": "2.1.8",
-    "last-sync": "5c837fa64d9383167e0391a286e91bcebdce2b3b"
+    "last-sync": "e027f372c436a79d941e781218d6f65f4c8ede87"
 }