Updated davclient.js

Fix for MKCOL in edge

core/vendor/davclient.js/lib/client.js

@@ -172,7 +172,13 @@ dav.Client.prototype = {
         for(ii in headers) {
             xhr.setRequestHeader(ii, headers[ii]);
         }
-        xhr.send(body);
+
+        // Work around for edge
+        if (body === undefined) {
+            xhr.send();
+        } else {
+            xhr.send(body);
+        }
 
         return new Promise(function(fulfill, reject) {