[skottie] Fix text error logging
[skottie] Fix text error logging

Don't clear the logger until we actually see some errors.

Change-Id: I275e99a6f2748dff1456a471daabb142fd1a10f2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/500996
Auto-Submit: Florin Malita <a8262bf13ea8c26821e91ea9bca6740a77c96dcd@chromium.org>
Reviewed-by: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>
Commit-Queue: Jorge Betancourt <63f45fa27f6ebe96d0924e755262c906d4cb18db@google.com>

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia