fix empty fetch subs call

[codecov[bot]]

Codecov Report

Merging #118 (75f95a1) into master (b20e645) will increase coverage by 5.43%. The diff coverage is 65.21%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   50.63%   56.07%   +5.43%     
==========================================
  Files          56       68      +12     
  Lines         628      749     +121     
==========================================
+ Hits          318      420     +102     
- Misses        310      329      +19     

Impacted Files	Coverage Δ
services/banks/rave.banks-branches.js	40.00% <0.00%> (-4.45%)	:arrow_down:
services/bills/rave.products-under-an-agency.js	40.00% <0.00%> (-4.45%)	:arrow_down:
services/misc/rave.resolve.account.js	44.44% <0.00%> (ø)
services/schema/auxillary.js	73.91% <ø> (ø)
services/schema/create.js	44.18% <ø> (ø)
services/subscriptions/rave.retrieve.single.js	44.44% <0.00%> (ø)
services/transfers/rave.fetch.js	40.00% <0.00%> (-4.45%)	:arrow_down:
lib/rave.base.js	78.78% <75.00%> (+42.12%)	:arrow_up:
lib/rave.transactions.js	78.94% <87.50%> (ø)
services/transactions/rave.events.js	100.00% <100.00%> (ø)
... and 1 more

... and 10 files with indirect coverage changes

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