Fix .head causing JsonSupport sink to terminate

[mdedetrich]

Resolves: #15

This seems to have been an honest mistake when copying the original code from the project at https://github.com/knutwalker/akka-stream-json/blob/master/http-json/src/main/scala/de/knutwalker/akka/http/JsonSupport.scala

I must have done some "optimization" or "improvement" while causing a regression that slipped through current test coverage.

[coveralls]

Pull Request Test Coverage Report for Build 10828056638

Details

• 20 of 27 (74.07%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-5.0%) to 88.976%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
http-json/src/main/scala/org/mdedetrich/pekko/http/JsonSupport.scala	20	27	74.07%

Files with Coverage Reduction	New Missed Lines	%
stream-json/src/main/scala/org/mdedetrich/pekko/json/stream/JsonStreamParser.scala	4	82.98%

Totals
Change from base Build 10810334661:	-5.0%
Covered Lines:	113
Relevant Lines:	127

---

💛 - Coveralls

[jrudolph]

I must have done some "optimization" or "improvement" while causing a regression that slipped through current test coverage.

Ah, interesting, that also explains the difference of behavior with Pekko :) Thanks for the quick fix.