cf deploy of mta file throwing panic: runtime error: invalid memory address or nil pointer dereference

Description

Describe your issue here. What is the expected behavior? What is the actual behavior?

Your environment

• MultiApps Controller version - multiapps 3.4.1
• MultiApps CF CLI Plugin version - cf -v 8.8.2
• which CF vendor is used - Downloaded from https://github.com/cloudfoundry/cli/wiki/V8-CLI-Installation-Guide

Steps to reproduce

build project using Cloud MTA Build Tool version 1.2.33.
Command used mbt build

After build, deploy the mta file using:
cf deploy mta_archives/xxx.mta
It is throwing the following error:

_panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x18 pc=0xa176ac]

goroutine 1 [running]:
github.com/cloudfoundry-incubator/multiapps-cli-plugin/commands.(*DeployCommand).getMtaArchive(0xb380d3?, {0xc0004126a0?, 0xc16818?, 0x1?}, {0x6?, 0x83?})
/root/go/src/github.com/cloudfoundry-incubator/multiapps-cli-plugin/commands/deploy_command.go:543 +0x16c
github.com/cloudfoundry-incubator/multiapps-cli-plugin/commands.(*DeployCommand).executeInternal(0xc000342540, {0xc0004126a0, 0x1, 0x1}, {0xc00001ce40, 0x2c}, 0xc000400780, {{{{0xc0004389c0, 0x24}, {0xc00040e810, ...}, ...}}, ...})
/root/go/src/github.com/cloudfoundry-incubator/multiapps-cli-plugin/commands/deploy_command.go:239 +0x205
github.com/cloudfoundry-incubator/multiapps-cli-plugin/commands.(*BaseCommand).Execute(0xc000191560, {0xc0000360b0, 0x1, 0x1})
/root/go/src/github.com/cloudfoundry-incubator/multiapps-cli-plugin/commands/base_command.go:122 +0x57a
main.(*MultiappsPlugin).Run(0xb39de3?, {0xc258f0, 0xc0002e7ba0}, {0xc0000360a0, 0x2, 0x2})
/root/go/src/github.com/cloudfoundry-incubator/multiapps-cli-plugin/multiapps_plugin.go:45 +0x1e9
code.cloudfoundry.org/cli/plugin.Start({0xc1d658, 0x10b8180})
/root/go/pkg/mod/code.cloudfoundry.org/cli@v7.1.0+incompatible/plugin/plugin_shim.go:34 +0x309
main.main()
/root/go/src/github.com/cloudfoundry-incubator/multiapps-cli-plugin/multiapps_plugin.go:65 +0x27_

Additional information

Start in commands/deploy_command.go at getMtaArchive line 543, then follow executeInternal at line 239. Reproduce with Cloud MTA Build Tool 1.2.33 and cf deploy mta_archives/xxx.mta using the listed versions. Done means the command no longer panics during MTA archive deployment.