Fix #1466, Fix Address Sanitizer issue in vxworks-console-testrunner

[avan989]

Fix #1466, Fix address sanitizer issue in coverage-vxworks-console-testrunner by moving getting the Table only when it is an valid index.

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Describe the contribution
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  Fix f-sanitizer detect runtime error in coverage-vxworks-console-testrunner #1466, moved Getting table only when it is an valid index.

Testing performed
Steps taken to test the contribution:
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

Expected behavior changes
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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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  Anh Van, GSFC