fix(bm-profiles): resolved nil pointer on resource type

[ujjwal-ibm]

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Relates OR Closes #0000

Output from acceptance testing:

% make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISBMSProfileDataSource_EmptyResourceType'
=== RUN   TestAccIBMISBMSProfileDataSource_EmptyResourceType
--- PASS: TestAccIBMISBMSProfileDataSource_EmptyResourceType (27.26s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     29.249s

% make testacc TEST=./ibm/service/vpc TESTARGS='-run=TestAccIBMISBMSProfilesDataSource_ResourceTypeNull'
=== RUN   TestAccIBMISBMSProfilesDataSource_ResourceTypeNull
--- PASS: TestAccIBMISBMSProfilesDataSource_ResourceTypeNull (21.64s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     23.692s