Fix another issue causing duplicated sent messages

b/13347399

Change-Id: I186813623426e86019a6fc37483138d7e255b2b0
diff --git a/src/com/android/exchange/eas/EasOutboxSync.java b/src/com/android/exchange/eas/EasOutboxSync.java
index e20a0de..66e0912 100644
--- a/src/com/android/exchange/eas/EasOutboxSync.java
+++ b/src/com/android/exchange/eas/EasOutboxSync.java
@@ -176,7 +176,7 @@
             } catch (final EmptyStreamException e) {
                 // This is actually fine; an empty stream means SendMail succeeded
                 LogUtils.d(LOG_TAG, "empty response sending mail");
-                return RESULT_OK;
+                // Don't return here, fall through so that we'll delete the sent message.
             } catch (final IOException e) {
                 // Parsing failed in some other way.
                 LogUtils.w(LOG_TAG, "IOException sending mail");