api: hotfix legacy endpoints, return an empty list like they always did

[altergui]

rather than a "404 page not found" all the legacy endpoints had different behaviours

endpoints that return an empty list
  * GET /accounts/{accountId}/fees/page/{page}
  * GET /accounts/page/{page}
  * GET /chain/organizations/page/{page}
  * POST /chain/organizations/filter/page/{page}
  * GET /chain/transactions/page/{page}
  * GET /chain/blocks/{height}/transactions/page/{page}
  * GET /chain/fees/page/{page}
  * GET /chain/fees/reference/{reference}/page/{page}
  * GET /chain/fees/type/{type}/page/{page}
  * POST /elections/filter/page/{page}
  * POST /elections/filter
  * GET /elections/page/{page}
  * GET /elections/{electionId}/votes/page/{page}

odd endpoints that return {}
  * GET /accounts/{organizationId}/elections/page/{page}
  * GET /accounts/{organizationId}/elections/status/{status}/page/{page}

odd endpoint that returns {"transfers":{"received":[],"sent":[]}}
  * GET /accounts/{accountId}/transfers/page/{page}

the new endpoints are of course unaffected, they still return "page not found":
  * GET /accounts
  * GET /chain/organizations
  * GET /chain/transactions
  * GET /chain/fees
  * GET /chain/transfers
  * GET /elections
  * GET /votes

[coveralls]

Pull Request Test Coverage Report for Build 10505648397

Details

• 72 of 246 (29.27%) changed or added relevant lines in 5 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 62.404%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
api/vote.go	6	10	60.0%
api/accounts.go	27	49	55.1%
api/elections.go	20	44	45.45%
api/legacy.go	0	49	0.0%
api/chain.go	19	94	20.21%

Files with Coverage Reduction	New Missed Lines	%
api/elections.go	1	70.29%

Totals
Change from base Build 10476530748:	-0.3%
Covered Lines:	16514
Relevant Lines:	26463

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💛 - Coveralls