Description of problem:
I opened another EWS user's Calendar to view it (verified I have access via Outlook in a Win7 VM).  When I removed it from my Calendar view (Right-click, select Delete), the calendar-factory backend crashed.

Version-Release number of selected component:
evolution-data-server-3.8.4-1.fc19

Additional info:
reporter:       libreport-2.1.5
backtrace_rating: 4
cmdline:        /usr/libexec/evolution-calendar-factory
crash_function: g_malloc
executable:     /usr/libexec/evolution-calendar-factory
kernel:         3.9.9-302.fc19.x86_64
runlevel:       N 5
uid:            1000
xsession_errors: 

Truncated backtrace:
Thread no. 1 (10 frames)
 #2 g_malloc at gmem.c:164
 #3 g_strndup at gstrfuncs.c:428
 #4 e_ews_dump_file_attachment_from_soap_parameter at e-ews-item.c:1567
 #5 ews_handle_attachments_param at e-ews-connection.c:5913
 #6 get_attachments_response_cb at e-ews-connection.c:5959
 #7 ews_response_cb at e-ews-connection.c:584
 #8 soup_session_process_queue_item at soup-session.c:1858
 #9 async_run_queue at soup-session.c:1896
 #10 idle_run_queue at soup-session.c:1930
 #15 e_ews_soup_thread at e-ews-connection.c:1454