fix #120, address sanitizer issue in fm_dispatch unit test

[avan989]

fix #120, fix passing in null as parameter in unit test

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Describe the contribution
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• Include explicitly what issue it addresses [e.g. Fixes #X]
  fixes Address Sanitizer issue in coverage-fm-fm_dispatch #120, fix run time error with address sanitizer.

Testing performed
Steps taken to test the contribution:
Add the following option:
add_compile_options(
-fsanitize=address
-fsanitize=undefined
-fsanitize-recover=all
-g
)
add_link_options(
-fsanitize=address
-fsanitize=undefined
-fsanitize-recover=all
)

Make SIMULATION=native ENABLE_UNIT_TESTS=true prep

make install

Run Test

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• API Change: xxx (if applicable)
• Behavior Change: xxx (if applicable)
• Or no impact to behavior

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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• Note CLA's apply to software contributions.
  Anh Van, GSFC

[dzbaker]

CCB 20 June 2024: Approved pending review by @jphickey.

[avan989]

updated to amend commit message. @dzbaker can you rerun the workflow?

[dzbaker]

CCB 8 August 2024: Approving at recommendation of @jphickey.