nil-ThrottleTimer.Stop() does nothing

Makefile

@@ -10,7 +10,7 @@ install:
 	go install github.com/tendermint/tendermint/cmd/debora
 	go install github.com/tendermint/tendermint/cmd/stdinwriter
 	go install github.com/tendermint/tendermint/cmd/logjack
-	@echo -n `git rev-parse --verify HEAD` > $(TMROOT)/revisions
+	@echo -n `git rev-parse --verify HEAD` >> $(TMROOT)/revisions
 
 build: 
 	go build -o build/tendermint github.com/tendermint/tendermint/cmd/tendermint
@@ -48,4 +48,4 @@ gen_client:
 	go generate rpc/core_client/*.go
 
 revision:
-	@echo -n `git rev-parse --verify HEAD` > $(TMROOT)/revisions
+	@echo -n `git rev-parse --verify HEAD` >> $(TMROOT)/revisions

common/throttle_timer.go

@@ -46,7 +46,12 @@ func (t *ThrottleTimer) Set() {
 	}
 }
 
+// For ease of .Stop()'ing services before .Start()'ing them,
+// we ignore .Stop()'s on nil ThrottleTimers
 func (t *ThrottleTimer) Stop() bool {
+	if t == nil {
+		return false
+	}
 	close(t.quit)
 	return t.timer.Stop()
 }