fix(@aws-amplify/datastore): return empty WeakMap

[iartemiev]

Last one (:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[manueliglesias]

LGTM

[codecov]

Codecov Report

Merging #7079 into main will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #7079      +/-   ##
==========================================
- Coverage   72.98%   72.98%   -0.01%     
==========================================
  Files         213      213              
  Lines       13294    13293       -1     
  Branches     2603     2507      -96     
==========================================
- Hits         9703     9702       -1     
- Misses       3395     3426      +31     
+ Partials      196      165      -31     

Impacted Files	Coverage Δ
packages/datastore/src/datastore/datastore.ts	77.77% <0.00%> (-0.05%)	⬇️
packages/auth/src/OAuth/OAuth.ts	56.11% <0.00%> (ø)
packages/core/src/Credentials.ts	31.51% <0.00%> (ø)
packages/analytics/src/Analytics.ts	63.58% <0.00%> (ø)
packages/datastore/src/sync/index.ts	15.07% <0.00%> (ø)
packages/datastore/src/sync/outbox.ts	24.00% <0.00%> (ø)
packages/datastore/src/storage/storage.ts	71.66% <0.00%> (ø)
packages/core/src/OAuthHelper/GoogleOAuth.ts	33.33% <0.00%> (ø)
packages/core/src/Util/Reachability.native.ts	37.50% <0.00%> (ø)
... and 10 more

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[github-actions]

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