Added an empty check on protocol_state_filtering_mode

[ujjwal-ibm]

…ervers

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Relates OR Closes #0000

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

[deepaksibm]

tfpt TestAccIBMISInstanceTemplate_vniPSFM
=== RUN   TestAccIBMISInstanceTemplate_vniPSFM
--- PASS: TestAccIBMISInstanceTemplate_vniPSFM (1119.19s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     1122.260s

tfpt TestAccIBMISInstance_vni_update
=== RUN   TestAccIBMISInstance_vni_update
no message sent
no message sent
--- PASS: TestAccIBMISInstance_vni_update (236.25s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     238.157s

tfpt TestAccIBMIsInstanceNetworkAttachmentAllArgsUpdate
=== RUN   TestAccIBMIsInstanceNetworkAttachmentAllArgsUpdate
no message sent
no message sent
--- PASS: TestAccIBMIsInstanceNetworkAttachmentAllArgsUpdate (261.50s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     263.692s

tfpt TestAccIBMIsInstanceNetworkAttachmentBasic
=== RUN   TestAccIBMIsInstanceNetworkAttachmentBasic
no message sent
no message sent
--- PASS: TestAccIBMIsInstanceNetworkAttachmentBasic (185.67s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     187.276s

tfpt TestAccIBMISInstance_basic
--- PASS: TestAccIBMISInstance_basic (345.60s)
=== RUN   TestAccIBMISInstance_basicwithipv4
no message sent
no message sent
--- PASS: TestAccIBMISInstance_basicwithipv4 (155.87s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     503.055s

tfpt TestAccIBMIsVirtualNetworkInterfacePStateFiltering
=== RUN   TestAccIBMIsVirtualNetworkInterfacePStateFiltering
--- PASS: TestAccIBMIsVirtualNetworkInterfacePStateFiltering (155.81s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     157.421s

tfpt TestAccIBMIsVirtualNetworkInterfaceBasic
=== RUN   TestAccIBMIsVirtualNetworkInterfaceBasic
--- PASS: TestAccIBMIsVirtualNetworkInterfaceBasic (167.46s)
PASS
ok      github.com/IBM-Cloud/terraform-provider-ibm/ibm/service/vpc     169.064s