Deep verification issue on Multi-Asset Transfers

[ipr0310]

Describe the bug
I found a verification issue on SignumJS
If i try to make a transaction of multiple tokens, without sending SIGNA
I get the following error:

You can notice that on API call, the node Returns Transaction Data To Sign properly
https://europe3.testnet.signum.network/api?requestType=transferAssetMulti&assetIdsAndQuantities=15784340403242018732%3A12800000000%3B13173437187473628239%3A2560000%3B9132784847255493112%3A5120000%3B14135672077489203546%3A10240000&amountNQT=&publicKey=6e1a0abea0cbacdc8c77a7de2868360d3e667b276a2f32bb847579d126d63e78&recipient=1673574549656521245&feeNQT=2000000&deadline=1440

To Reproduce
Steps to reproduce the behavior:

1. Go to https://test.signumswap.com/tokens/transfer
2. Try to create a multi-asset transfer, WITHOUT sending SIGNA
   

Additional context
Issue happens only when SIGNA is not getting sent, if SIGNA is going to be sent, deep verification goes ok