Milo: Fix empty lines in step text

milo/api/proto/buildbot.pb.go

 // Code generated by protoc-gen-go.
 // source: github.com/luci/luci-go/milo/api/proto/buildbot.proto
 // DO NOT EDIT!
 
 /*
 Package milo is a generated protocol buffer package.
 
 It is generated from these files:
         github.com/luci/luci-go/milo/api/proto/buildbot.proto
         github.com/luci/luci-go/milo/api/proto/buildinfo.proto
@@ skipping 377 matching lines @@
         Streams:  []grpc.StreamDesc{},
         Metadata: "github.com/luci/luci-go/milo/api/proto/buildbot.proto",
 }
 
 func init() {
         proto.RegisterFile("github.com/luci/luci-go/milo/api/proto/buildbot.proto", fileDescriptor0)
 }
 
 var fileDescriptor0 = []byte{
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 }