Fix: subscription with nextLink undefined error and fix duplicate calls

[timotheeguerin]

fix #1872

When listing subscription if the call add a nextLink to follow it was not returning which caused a undefined error

[codecov]

Codecov Report

Merging #1873 into stable will increase coverage by 0.36%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           stable    #1873      +/-   ##
==========================================
+ Coverage   61.64%   62.01%   +0.36%     
==========================================
  Files         970      970              
  Lines       26481    26483       +2     
  Branches     4848     4848              
==========================================
+ Hits        16325    16423      +98     
+ Misses      10118    10022      -96     
  Partials       38       38

Impacted Files	Coverage Δ
...pp/services/batch-account/batch-account.service.ts	63.39% <ø> (ø)	⬆️
...ervices/batch-account/arm-batch-account.service.ts	43.87% <ø> (ø)	⬆️
src/app/services/storage-account.service.ts	9.09% <ø> (ø)	⬆️
src/app/services/compute.service.ts	23.07% <ø> (ø)	⬆️
...ount/browse/account-list/account-list.component.ts	78.04% <0%> (ø)	⬆️
.../app/services/subscription/subscription.service.ts	67.64% <100%> (ø)
src/app/models/tenant-details.ts	100% <0%> (+40%)	⬆️
src/app/services/azure-http.service.ts	51.42% <0%> (+45.71%)	⬆️

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