Fix #100, Check CFE_SB_NO_MESSAGE return code

[anhvan989]

Fix #100, check cfe_sb_no_message return code from CFE_SB_ReceiveBuffer

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• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution
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Add check for CFE_SB_NO_MESSAGE.

Testing performed
Steps taken to test the contribution:

1. make native_std.prep

2. make native_std.install

3. cd build-native_std/exe/cpu1/

4. ./core-cpu1

5. make native_std.runtest

6. make native_std.lcov

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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Third party code
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• Note CLA's apply to software contributions.

Anh Van, GSFC

[chillfig]

Looks good to me. Enables the user to run MM with a "polling" configuration and avoid exiting out.