Panic when opc_compute_vnic_set applied_acls contains empty value

[scross01]

Terraform Version

Terraform v0.11.8

Affected Resource(s)

• opc_vnic_set

Terraform Configuration Files

resource "opc_compute_vnic_set" "default" {
  name         = "${local.project}-default-vnic-set"
  applied_acls = ["${opc_compute_acl.default.name}", ""]
}

Note the "" in the applied_acls list

Debug Output

https://gist.github.com/scross01/e8ea184b6d74dd95016f5d7997089544 console.log

Panic Output

https://gist.github.com/scross01/e8ea184b6d74dd95016f5d7997089544 crash.log

panic: interface conversion: interface {} is nil, not string
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: goroutine 161 [running]:
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: github.com/terraform-providers/terraform-provider-opc/opc.getStringList(0xc4202cd030, 0x184bd91, 0xc, 0x1723980, 0x1d3cae0, 0x0)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/tmp/go/src/github.com/terraform-providers/terraform-provider-opc/opc/helpers.go:21 +0x21e
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: github.com/terraform-providers/terraform-provider-opc/opc.resourceOPCVNICSetUpdate(0xc4202cd030, 0x175b5c0, 0xc4203ef220, 0x24, 0x1d3cae0)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/tmp/go/src/github.com/terraform-providers/terraform-provider-opc/opc/resource_vnic_set.go:140 +0x1f0
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: github.com/terraform-providers/terraform-provider-opc/vendor/github.com/hashicorp/terraform/helper/schema.(*Resource).Apply(0xc4205eb140, 0xc420466960, 0xc42041bba0, 0x175b5c0, 0xc4203ef220, 0x1, 0xc4202054d0, 0xc4202054d0)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/tmp/go/src/github.com/terraform-providers/terraform-provider-opc/vendor/github.com/hashicorp/terraform/helper/schema/resource.go:199 +0x2ab
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: github.com/terraform-providers/terraform-provider-opc/vendor/github.com/hashicorp/terraform/helper/schema.(*Provider).Apply(0xc420202bd0, 0xc420466910, 0xc420466960, 0xc42041bba0, 0x1f67458, 0x0, 0x18)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/tmp/go/src/github.com/terraform-providers/terraform-provider-opc/vendor/github.com/hashicorp/terraform/helper/schema/provider.go:259 +0xa4
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: github.com/terraform-providers/terraform-provider-opc/vendor/github.com/hashicorp/terraform/plugin.(*ResourceProviderServer).Apply(0xc420440fa0, 0xc42041bb40, 0xc4203e2ca0, 0x0, 0x0)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/tmp/go/src/github.com/terraform-providers/terraform-provider-opc/vendor/github.com/hashicorp/terraform/plugin/resource_provider.go:488 +0x57
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: reflect.Value.call(0xc42028fda0, 0xc420092738, 0x13, 0x1844d9a, 0x4, 0xc4202d8f20, 0x3, 0x3, 0x5, 0x1850e7a, ...)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/usr/local/Cellar/go@1.9/1.9.7/libexec/src/reflect/value.go:434 +0x905
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: reflect.Value.Call(0xc42028fda0, 0xc420092738, 0x13, 0xc4205c3f20, 0x3, 0x3, 0x1723980, 0x18f33f0, 0x1723980)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/usr/local/Cellar/go@1.9/1.9.7/libexec/src/reflect/value.go:302 +0xa4
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: net/rpc.(*service).call(0xc420612a00, 0xc4203fc140, 0xc42040a218, 0xc4205a6080, 0xc4203ef780, 0x1704780, 0xc42041bb40, 0x16, 0x17047c0, 0xc4203e2ca0, ...)
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/usr/local/Cellar/go@1.9/1.9.7/libexec/src/net/rpc/server.go:381 +0x142
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: created by net/rpc.(*Server).ServeCodec
2018-08-29T21:19:42.264-0400 [DEBUG] plugin.terraform-provider-opc: 	/usr/local/Cellar/go@1.9/1.9.7/libexec/src/net/rpc/server.go:475 +0x36b

Steps to Reproduce

Please list the steps required to reproduce the issue, for example:

1. terraform apply