Fix error when issuing TSO commands

[t1m0thyj]

Fixes #255 and updates the system test for Tso.issue_command to verify that the response is successful

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.88%. Comparing base (a8c5794) to head (35c9c0b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #257 +/- ## ========================================== + Coverage 83.83% 84.88% +1.04% ========================================== Files 34 34 Lines 2116 2124 +8 ========================================== + Hits 1774 1803 +29 + Misses 342 321 -21 ``` | [Flag](https://app.codecov.io/gh/zowe/zowe-client-python-sdk/pull/257/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zowe) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/zowe/zowe-client-python-sdk/pull/257/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zowe) | `84.88% <100.00%> (+1.04%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=zowe#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

Release succeeded for the main branch. :tada:

The following packages have been published:

• pypi: zowe-1.0.0.dev15
• pypi: zowe_core_for_zowe_sdk-1.0.0.dev15
• pypi: zowe_zos_console_for_zowe_sdk-1.0.0.dev15
• pypi: zowe_zos_files_for_zowe_sdk-1.0.0.dev15
• pypi: zowe_zos_jobs_for_zowe_sdk-1.0.0.dev15
• pypi: zowe_zos_tso_for_zowe_sdk-1.0.0.dev15
• pypi: zowe_zosmf_for_zowe_sdk-1.0.0.dev15

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