Fix #2597, fix sb coverage test failure

[avan989]

Fix #2597, fix sb coverage test failure involving topic ID

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Fix #2597, fix sb coverage test failure involving topic ID. Resolved issue with SB coverage test failure when topic ID is not used.

Testing performed
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1. Ran against DAVINCI code's
2. Ran against Opensource

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• API Change: xxx (if applicable)
• Behavior Change: xxx (if applicable)
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System(s) tested on

• Hardware: [e.g. PC, SP0, MCP750]
• OS: [e.g. Ubuntu 18.04, RTEMS 4.11, VxWorks 6.9]
• Versions: [e.g. cFE 6.6, OSAL 4.2, PSP 1.3 for mcp750, any related apps or tools]

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Anh Van, GSFC