Change the logging for errors loading attachment

b/11436795
It's not really an error condition to get a fileNotFound
trying to load an attachment, it's normal if the attachment
has not yet been downloaded. We don't need to spam the log
with stack traces when this happens.

Change-Id: I2e177d639d4eec69b72ee8692827d22675758768
diff --git a/src/com/android/mail/ui/ThumbnailLoadTask.java b/src/com/android/mail/ui/ThumbnailLoadTask.java
index c30864e..f4d2d35 100644
--- a/src/com/android/mail/ui/ThumbnailLoadTask.java
+++ b/src/com/android/mail/ui/ThumbnailLoadTask.java
@@ -144,7 +144,8 @@
             }
             return originalBitmap;
         } catch (Throwable t) {
-            LogUtils.e(LOG_TAG, t, "Unable to decode thumbnail %s", thumbnailUri);
+            LogUtils.i(LOG_TAG, "Unable to decode thumbnail %s: %s %s", thumbnailUri,
+                    t.getClass(), t.getMessage());
         } finally {
             if (fd != null) {
                 try {
@@ -169,7 +170,8 @@
             in = resolver.openInputStream(thumbnailUri);
             return Exif.getOrientation(in, -1);
         } catch (Throwable t) {
-            LogUtils.e(LOG_TAG, t, "Unable to get orientation of thumbnail %s", thumbnailUri);
+            LogUtils.i(LOG_TAG, "Unable to get orientation of thumbnail %s: %s %s", thumbnailUri,
+                    t.getClass(), t.getMessage());
         } finally {
             if (in != null) {
                 try {