fix context usage across codebase

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

logger/context.go

@@ -6,12 +6,18 @@ type loggerKey struct{}
 
 // FromContext returns logger from passed context
 func FromContext(ctx context.Context) (Logger, bool) {
+	if ctx == nil {
+		return nil, false
+	}
 	l, ok := ctx.Value(loggerKey{}).(Logger)
 	return l, ok
 }
 
 // NewContext stores logger into passed context
 func NewContext(ctx context.Context, l Logger) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
 	return context.WithValue(ctx, loggerKey{}, l)
 }