fix(mojaloop/#2585): bulk-api-adapter fails when extensionLists are n…

…ot send in post /bulktransfer (#35)

fix for mojaloop/project#2585:
- added some safety checks on chained object "dot" notation references
- aligned .nvmrc to ci-cd builds (i.e. Node v12.16.1)

.nvmrc

@@ -1 +1 @@
-10.15.1
+12.16.1

src/bulkTransfers/schema/individualTransfer.js

@@ -75,7 +75,7 @@ const getIndividualTransferSchema = () => {
       }))
   }
   IndividualTransferSchema.pre('save', function () {
-    if (!this.payload.extensionList.extension.length) {
+    if (!this.payload.extensionList || !this.payload.extensionList.extension || !this.payload.extensionList.extension.length) {
       delete this._doc.payload.extensionList
     }
   })

src/bulkTransfers/schema/individualTransferFulfil.js

@@ -66,7 +66,7 @@ const getIndividualTransferFulfilSchema = () => {
       }))
   }
   IndividualTransferFulfilSchema.pre('save', function () {
-    if (!this.payload.extensionList.extension.length) {
+    if (!this.payload.extensionList || !this.payload.extensionList.extension || !this.payload.extensionList.extension.length) {
       delete this._doc.payload.extensionList
     }
   })