Fixed NPE when multiple encryption paths are provided.

Author: ech0s7r

lib/mcapi/fle/field-level-encryption.js

@@ -134,13 +134,15 @@ function decrypt(response) {
  */
 function encryptBody(path, body) {
   let elem = elemFromPath(path.element, body);
-  let encryptedData = this.crypto.encryptData({data: elem.node});
-  utils.mutateObjectProperty(path.obj,
-    encryptedData,
-    body);
-  // delete encrypted field if not overridden
-  if (path.element !== path.obj + "." + this.config.encryptedValueFieldName) {
-    utils.deleteNode(path.element, body);
+  if (elem){
+    let encryptedData = this.crypto.encryptData({data: elem.node});
+    utils.mutateObjectProperty(path.obj,
+      encryptedData,
+      body);
+    // delete encrypted field if not overridden
+    if (path.element !== path.obj + "." + this.config.encryptedValueFieldName) {
+      utils.deleteNode(path.element, body);
+    }
   }
 }