pkg/api: Check errors (#19657)

* pkg/api: Check errors
* pkg/api: Remove unused function HashEmail

pkg/api/common.go

@@ -55,7 +55,9 @@ func (r *NormalResponse) WriteTo(ctx *m.ReqContext) {
 		header[k] = v
 	}
 	ctx.Resp.WriteHeader(r.status)
-	ctx.Resp.Write(r.body)
+	if _, err := ctx.Resp.Write(r.body); err != nil {
+		ctx.Logger.Error("Error writing to response", "err", err)
+	}
 }
 
 func (r *NormalResponse) Cache(ttl string) *NormalResponse {