WIP: test case for import namespace when only rendering systemjs

[sastan]

This MR has no solution for the described problem. I created it as a showcase for the problem and to work on a solution.

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers: #3730

Description

Generating only a systemjs bundle with a namespace export fails. This only happens when no other output is generated for that bundle. If a esm or cjs bundle is generated before the system bundle, the system is valid.

I am willing to create a working MR but i need some pointers where to start. For the moment i'm out of ideas.

[lukastaegert]

Thanks! I can base a solution on this one if you do not mind.

[codecov]

Codecov Report

Merging #3731 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3731   +/-   ##
=======================================
  Coverage   96.98%   96.98%           
=======================================
  Files         184      184           
  Lines        6430     6431    +1     
  Branches     1861     1862    +1     
=======================================
+ Hits         6236     6237    +1     
  Misses        103      103           
  Partials       91       91           

Impacted Files	Coverage Δ
src/Chunk.ts	100.00% <100.00%> (ø)

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