time_utils: don't complain about missing imports

We handle the error case just fine, and our chroot doesn't include
tzlocal by default. This just means that we get pointless errors in our
logs when running 'test_that'.

BUG=none
TEST=`test_that ...`

Change-Id: Iedc72cc38b4050c1da313895d95ceec4b6502bfa
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/480937
Reviewed-by: Richard Barnette <jrbarnette@google.com>
diff --git a/client/common_lib/time_utils.py b/client/common_lib/time_utils.py
index 5848493..e5920df 100644
--- a/client/common_lib/time_utils.py
+++ b/client/common_lib/time_utils.py
@@ -5,7 +5,6 @@
 # This module contains some commonly used time conversion function.
 
 import datetime
-import logging
 import time
 
 from autotest_lib.client.common_lib import decorators
@@ -15,14 +14,12 @@
     import pytz
 except ImportError:
     pytz = None
-    logging.error('Could not import pytz.')
 
 
 try:
     import tzlocal
 except ImportError:
     tzlocal = None
-    logging.error('Could not import tzlocal.')
 
 
 # This format is used to parse datetime value in MySQL database and should not
@@ -118,4 +115,4 @@
     epoch = datetime.datetime(1970, 1, 1, tzinfo=pytz.utc)
     local_datetime = datetime_val.replace(tzinfo=tzlocal.get_localzone())
     utc_datetime = local_datetime.astimezone(tz=pytz.utc)
-    return (utc_datetime - epoch).total_seconds()
\ No newline at end of file
+    return (utc_datetime - epoch).total_seconds()