Milo: Fix empty lines in step text

milo/api/proto/buildinfo.pb.go

 // Code generated by protoc-gen-go.
 // source: github.com/luci/luci-go/milo/api/proto/buildinfo.proto
 // DO NOT EDIT!
 
 package milo
 
 import prpc "github.com/luci/luci-go/grpc/prpc"
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
@@ skipping 342 matching lines @@
         Streams:  []grpc.StreamDesc{},
         Metadata: "github.com/luci/luci-go/milo/api/proto/buildinfo.proto",
 }
 
 func init() {
         proto.RegisterFile("github.com/luci/luci-go/milo/api/proto/buildinfo.proto", fileDescriptor1)
 }
 
 var fileDescriptor1 = []byte{
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 }