Fixes#10042Fixes#9989
Another panic was found with this resource. IT essentially was causing a
panic when no certificates were found. This was due to the casting of
status to []string
There are times when there are no statuses passed in. Made the error
message a lot more generic now rather than having something like this
```
No certificate with statuses [] for domain mytestdomain.com found in this region.
```
This now becomes:
```
No certificate for domain mytestdomain.com found in this region.
```
Also, added a test to show that the panic is gone
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAwsAcmCertificateDataSource_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2016/11/11 15:11:33 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v
-run=TestAccAwsAcmCertificateDataSource_ -timeout 120m
=== RUN TestAccAwsAcmCertificateDataSource_noMatchReturnsError
--- PASS: TestAccAwsAcmCertificateDataSource_noMatchReturnsError (6.07s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws6.094s
```
3472cab7d6