Fix if the route table changed to none

[yuwzho]

SUMMARY

Fixes #49419

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

ADDITIONAL INFORMATION

2.7.0

[ansibot]

cc @haroldwongms @nitzmahone @trstringer @xscript @zikalino
click here for bot help

[gundalow]

@jerrynn @Fred-sun could you please test this PR and confirm if it fixes your issue in #49419

[Fred-sun]

@gundalow I have tried but fail, fail info same with report. Thanks!
@yuwzho could you help recheck it? Thanks!

fatal: [localhost]: FAILED! => {
    "changed": false, 
    "module_stderr": "Traceback (most recent call last):\n  File \"/home/fred/.ansible/tmp/ansible-tmp-1544006820.25-276246544239643/AnsiballZ_azure_rm_subnet.py\", line 113, in <module>\n    _ansiballz_main()\n  File \"/home/fred/.ansible/tmp/ansible-tmp-1544006820.25-276246544239643/AnsiballZ_azure_rm_subnet.py\", line 105, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)\n  File \"/home/fred/.ansible/tmp/ansible-tmp-1544006820.25-276246544239643/AnsiballZ_azure_rm_subnet.py\", line 48, in invoke_module\n    imp.load_module('__main__', mod, module, MOD_DESC)\n  File \"/tmp/ansible_azure_rm_subnet_payload_TL_IYA/__main__.py\", line 386, in <module>\n  File \"/tmp/ansible_azure_rm_subnet_payload_TL_IYA/__main__.py\", line 382, in main\n  File \"/tmp/ansible_azure_rm_subnet_payload_TL_IYA/__main__.py\", line 228, in __init__\n  File \"/tmp/ansible_azure_rm_subnet_payload_TL_IYA/ansible_azure_rm_subnet_payload.zip/ansible/module_utils/azure_rm_common.py\", line 310, in __init__\n  File \"/tmp/ansible_azure_rm_subnet_payload_TL_IYA/__main__.py\", line 279, in exec_module\nUnboundLocalError: local variable 'route_table' referenced before assignment\n", 
    "module_stdout": "", 
    "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", 
    "rc": 1
}
	to retry, use: --limit @/home/fred/task/49419/1.retry

[yuwzho]

@Fred-sun Please re-test

[Fred-sun]

Thanks yuwzhou, I have tested and got success result, Please review the test result.
@gundalow Please help re-review this and push for merged. Thanks!

TASK [Create subnet with router table] ***************************************************************************
changed: [localhost]

TASK [debug] *****************************************************************************************************
ok: [localhost] => {
    "output01": {
        "changed": true, 
        "failed": false, 
        "state": {
            "address_prefix": "10.0.1.0/24", 
            "id": "/subscriptions/2085065b-00f8-4cba-9675-ba15f4d4ab66/resourceGroups/myRG04/providers/Microsoft.Network/virtualNetworks/mynetwork01/subnets/mysubnet01", 
            "name": "mysubnet01", 
            "network_security_group": {
                "id": "/subscriptions/2085065b-00f8-4cba-9675-ba15f4d4ab66/resourceGroups/cleanupservice/providers/Microsoft.Network/networkSecurityGroups/rg-cleanupservice-nsg123", 
                "name": "rg-cleanupservice-nsg123", 
                "resource_group": "cleanupservice"
            }, 
            "provisioning_state": "Succeeded", 
            "route_table": {
                "id": "/subscriptions/2085065b-00f8-4cba-9675-ba15f4d4ab66/resourceGroups/myRG04/providers/Microsoft.Network/routeTables/foobar", 
                "name": "foobar", 
                "resource_group": "myRG04"
            }
        }
    }
}

TASK [update the subnet without router table] ********************************************************************
changed: [localhost]

TASK [debug] *****************************************************************************************************
ok: [localhost] => {
    "output": {
        "changed": true, 
        "failed": false, 
        "state": {
            "address_prefix": "10.0.1.0/24", 
            "id": "/subscriptions/2085065b-00f8-4cba-9675-ba15f4d4ab66/resourceGroups/myRG04/providers/Microsoft.Network/virtualNetworks/mynetwork01/subnets/mysubnet01", 
            "name": "mysubnet01", 
            "network_security_group": {
                "id": "/subscriptions/2085065b-00f8-4cba-9675-ba15f4d4ab66/resourceGroups/cleanupservice/providers/Microsoft.Network/networkSecurityGroups/rg-cleanupservice-nsg123", 
                "name": "rg-cleanupservice-nsg123", 
                "resource_group": "cleanupservice"
            }, 
            "provisioning_state": "Succeeded", 
            "route_table": {}
        }
    }
}

PLAY RECAP *******************************************************************************************************
localhost                  : ok=8    changed=2    unreachable=0    failed=0    skipped=0