fix(atracker) do not return region if it is not defined for resource

[wenjian2]

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Relates OR Closes #0000

Output from acceptance testing:

Test 1:

$ make testacc TEST=./ibm/service/atracker TESTARGS='-run=TestAccIBMAtracker*'
=== RUN   TestAccIBMAtrackerRoutesDataSourceBasic
--- PASS: TestAccIBMAtrackerRoutesDataSourceBasic (16.00s)
=== RUN   TestAccIBMAtrackerTargetsDataSourceBasic
--- PASS: TestAccIBMAtrackerTargetsDataSourceBasic (12.91s)
=== RUN   TestAccIBMAtrackerTargetsDataSourceAllArgs
--- PASS: TestAccIBMAtrackerTargetsDataSourceAllArgs (13.19s)
=== RUN   TestAccIBMAtrackerRouteBasic
--- PASS: TestAccIBMAtrackerRouteBasic (24.16s)
=== RUN   TestAccIBMAtrackerRouteBasicMultipleRules
--- PASS: TestAccIBMAtrackerRouteBasicMultipleRules (24.18s)
=== RUN   TestAccIBMAtrackerSettingsBasic
--- PASS: TestAccIBMAtrackerSettingsBasic (12.96s)
=== RUN   TestAccIBMAtrackerSettingsAllArgs
--- PASS: TestAccIBMAtrackerSettingsAllArgs (14.15s)
=== RUN   TestAccIBMAtrackerTargetBasic
--- PASS: TestAccIBMAtrackerTargetBasic (20.94s)
=== RUN   TestAccIBMAtrackerTargetAllArgs
--- PASS: TestAccIBMAtrackerTargetAllArgs (23.56s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/atracker        163.643s

Test 2:

$ TF_ACC=1 go test ./ibm/service/atracker -timeout 700m -v
=== RUN   TestAccIBMAtrackerRoutesDataSourceBasic
--- PASS: TestAccIBMAtrackerRoutesDataSourceBasic (13.88s)
=== RUN   TestDataSourceIBMAtrackerRoutesRouteToMap
--- PASS: TestDataSourceIBMAtrackerRoutesRouteToMap (0.00s)
=== RUN   TestDataSourceIBMAtrackerRoutesRuleToMap
--- PASS: TestDataSourceIBMAtrackerRoutesRuleToMap (0.00s)
=== RUN   TestAccIBMAtrackerTargetsDataSourceBasic
--- PASS: TestAccIBMAtrackerTargetsDataSourceBasic (12.30s)
=== RUN   TestAccIBMAtrackerTargetsDataSourceAllArgs
--- PASS: TestAccIBMAtrackerTargetsDataSourceAllArgs (12.67s)
=== RUN   TestAccIBMAtrackerRouteBasic
--- PASS: TestAccIBMAtrackerRouteBasic (23.55s)
=== RUN   TestAccIBMAtrackerRouteBasicMultipleRules
--- PASS: TestAccIBMAtrackerRouteBasicMultipleRules (25.02s)
=== RUN   TestResourceIBMAtrackerRouteRuleToMap
--- PASS: TestResourceIBMAtrackerRouteRuleToMap (0.00s)
=== RUN   TestResourceIBMAtrackerRouteMapToRulePrototype
--- PASS: TestResourceIBMAtrackerRouteMapToRulePrototype (0.00s)
=== RUN   TestAccIBMAtrackerSettingsBasic
--- PASS: TestAccIBMAtrackerSettingsBasic (11.96s)
=== RUN   TestAccIBMAtrackerSettingsAllArgs
--- PASS: TestAccIBMAtrackerSettingsAllArgs (15.24s)
=== RUN   TestAccIBMAtrackerTargetBasic
--- PASS: TestAccIBMAtrackerTargetBasic (20.55s)
=== RUN   TestAccIBMAtrackerTargetAllArgs
--- PASS: TestAccIBMAtrackerTargetAllArgs (22.41s)
=== RUN   TestResourceIBMAtrackerTargetCosEndpointToMap
--- PASS: TestResourceIBMAtrackerTargetCosEndpointToMap (0.00s)
=== RUN   TestResourceIBMAtrackerTargetEventstreamsEndpointToMap
--- PASS: TestResourceIBMAtrackerTargetEventstreamsEndpointToMap (0.00s)
=== RUN   TestResourceIBMAtrackerTargetCloudLogsEndpointToMap
--- PASS: TestResourceIBMAtrackerTargetCloudLogsEndpointToMap (0.00s)
=== RUN   TestResourceIBMAtrackerTargetWriteStatusToMap
--- PASS: TestResourceIBMAtrackerTargetWriteStatusToMap (0.00s)
=== RUN   TestResourceIBMAtrackerTargetMapToCosEndpointPrototype
--- PASS: TestResourceIBMAtrackerTargetMapToCosEndpointPrototype (0.00s)
=== RUN   TestResourceIBMAtrackerTargetMapToEventstreamsEndpointPrototype
--- PASS: TestResourceIBMAtrackerTargetMapToEventstreamsEndpointPrototype (0.00s)
=== RUN   TestResourceIBMAtrackerTargetMapToCloudLogsEndpointPrototype
--- PASS: TestResourceIBMAtrackerTargetMapToCloudLogsEndpointPrototype (0.00s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/atracker        159.069s

[wenjian2]

Fix issue #6191