server: cleanup null panics

[adamdecaf]

2018/12/13 16:57:21 http: panic serving 10.60.34.15:53858: runtime error: invalid memory address or nil pointer dereference
goroutine 62438 [running]:
net/http.(*conn).serve.func1(0xc000397680)
	/usr/local/go/src/net/http/server.go:1746 +0xd0
panic(0x8c1860, 0xd23720)
	/usr/local/go/src/runtime/panic.go:513 +0x1b9
github.com/moov-io/ach/server.(*repositoryInMemory).FindAllBatches(0xc00000b700, 0xc00039000b, 0x5, 0x0, 0x0, 0x0)
	/go/src/github.com/moov-io/ach/server/repository.go:115 +0xc9
github.com/moov-io/ach/server.(*service).GetBatches(0xc000051760, 0xc00039000b, 0x5, 0xc000051760, 0x9d42e0, 0xc000124600)
	/go/src/github.com/moov-io/ach/server/service.go:159 +0x47
github.com/moov-io/ach/server.loggingMiddleware.GetBatches(0x9db9e0, 0xc000051760, 0x9d42e0, 0xc000124600, 0xc00039000b, 0x5, 0x0, 0x0, 0x0)
	/go/src/github.com/moov-io/ach/server/logging.go:134 +0xcc
github.com/moov-io/ach/server.getBatchesEndpoint.func1(0x9d8ba0, 0xc0001905d0, 0x8d2060, 0xc0004ded00, 0xc0004ded00, 0x0, 0x0, 0x40baef)
	/go/src/github.com/moov-io/ach/server/batches.go:89 +0x61
github.com/moov-io/ach/vendor/github.com/go-kit/kit/transport/http.Server.ServeHTTP(0xc000134060, 0x96fd40, 0x96fd70, 0xc00000c260, 0x1, 0x1, 0xc00000c268, 0x1, 0x1, 0x96fd68, ...)
	/go/src/github.com/moov-io/ach/vendor/github.com/go-kit/kit/transport/http/server.go:110 +0x310
github.com/moov-io/ach/vendor/github.com/gorilla/mux.(*Router).ServeHTTP(0xc000108b60, 0x9d8520, 0xc000394620, 0xc000120600)
	/go/src/github.com/moov-io/ach/vendor/github.com/gorilla/mux/mux.go:162 +0xf1
net/http.serverHandler.ServeHTTP(0xc000063d40, 0x9d8520, 0xc000394620, 0xc000120400)
	/usr/local/go/src/net/http/server.go:2741 +0xab
net/http.(*conn).serve(0xc000397680, 0x9d8ae0, 0xc000266180)
	/usr/local/go/src/net/http/server.go:1847 +0x646
created by net/http.(*Server).Serve
	/usr/local/go/src/net/http/server.go:2851 +0x2f5

[codecov-io]

Codecov Report

Merging #406 into master will decrease coverage by 0.58%.
The diff coverage is 65.38%.

@@            Coverage Diff             @@
##           master     #406      +/-   ##
==========================================
- Coverage   85.14%   84.56%   -0.59%     
==========================================
  Files         110      110              
  Lines        6841     8895    +2054     
==========================================
+ Hits         5825     7522    +1697     
- Misses        724     1078     +354     
- Partials      292      295       +3

Impacted Files	Coverage Δ
server/repository.go	85.71% <65.38%> (-9.45%)	⬇️
test/ach-adv-read/main.go	55.55% <0%> (-8.09%)	⬇️
test/ach-axt-read/main.go	57.14% <0%> (-8.08%)	⬇️
test/ach-ccd-read/main.go	57.14% <0%> (-8.08%)	⬇️
test/ach-iat-read/main.go	60% <0%> (-8%)	⬇️
test/ach-trc-read/main.go	47.82% <0%> (-7.73%)	⬇️
test/ach-trx-read/main.go	47.82% <0%> (-7.73%)	⬇️
test/ach-xck-read/main.go	47.82% <0%> (-7.73%)	⬇️
test/ach-web-read/main.go	65.71% <0%> (-7.62%)	⬇️
test/ach-shr-read/main.go	45.45% <0%> (-7.49%)	⬇️
... and 97 more

---

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