cbuild assumes that the components element in a cprj file has at least one component sub-element, but this may be null and result in a compilation failure

[HalfSweet]

Describe the bug In some small projects, we may not reference components, such as CMSIS CORE, so that when running the cbuild command, the resulting .crpj file will have only a single

<components/>

without any component sub-elements.

This will trigger an xmllint error, and the output log will look roughly as follows:

info cbuild: (1/1) Building context: "Project+PY32F002Bx5Project"
Element 'components': Missing child element(s). Expected is ( component ).
d:\OpenPuya\PY32F002B_Firmware\Templates\PY32F002Bxx_Templates_LL\MDK-ARM\Project+PY32F002Bx5Project.cprj fails to validate
error cbuild: error executing 'xmllint'
error cbuild: error building 'd:\OpenPuya\PY32F002B_Firmware\Templates\PY32F002Bxx_Templates_LL\MDK-ARM\Project+PY32F002Bx5Project. cprj'
error cbuild: exit status 3
Process failed with exit code 4294967295
Process failed with exit code 4294967295

To Reproduce Steps to reproduce the behavior: A link to a reproducible project: https://github.com/OpenPuya/PY32F002B_Firmware/tree/master/Templates/PY32F002Bxx_Templates_LL

It is a uvprojx project, so it needs to be converted with the uv2csolution tool

Expected behavior Expectedly, no errors should be reported

Environment (please complete the following information):

• tool: cbuild
• Version: 2.2.1
• OS: Windows

Additional context Add any other context about the problem here.

[jkrech]

In my view, in this case no <components> section should be generated.