Fix nil-pointer issue with misconfigured tracing

Co-authored-by: Jörn Friedrich Dreyer <jfd@butonic.de>

Signed-off-by: Christian Richter <crichter@owncloud.com>

services/ocs/pkg/middleware/logtrace.go

@@ -1,28 +0,0 @@
-package middleware
-
-import (
-	"net/http"
-
-	ocstracing "github.com/owncloud/ocis/v2/services/ocs/pkg/tracing"
-	"go.opentelemetry.io/otel/propagation"
-	"go.opentelemetry.io/otel/trace"
-)
-
-var propagator = propagation.NewCompositeTextMapPropagator(
-	propagation.Baggage{},
-	propagation.TraceContext{},
-)
-
-// LogTrace Sets the initial trace in the ocs service.
-func LogTrace(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		spanOpts := []trace.SpanStartOption{
-			trace.WithSpanKind(trace.SpanKindServer),
-		}
-		ctx, span := ocstracing.TraceProvider.Tracer("ocs").Start(r.Context(), r.URL.Path, spanOpts...)
-		defer span.End()
-
-		propagator.Inject(ctx, propagation.HeaderCarrier(r.Header))
-		next.ServeHTTP(w, r.WithContext(ctx))
-	})
-}