Lack of core files shouldn't cause failure.

Change-Id: I44a2a35d3339764463118e949dea3740923b55d0
Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
diff --git a/lib/openbmc_ffdc_methods.robot b/lib/openbmc_ffdc_methods.robot
index cdd94fa..2caf6b1 100755
--- a/lib/openbmc_ffdc_methods.robot
+++ b/lib/openbmc_ffdc_methods.robot
@@ -237,8 +237,7 @@
     [Documentation]  Copy core dump file from BMC to local system.
     # Check if core dump exist in the /tmp
     Open Connection And Log In
-    ${core_files}=  Execute Command On BMC  ls /tmp/core_*
-    Should Not Contain  ${core_files}  No such file or directory
+    ${core_files}=  Execute Command  ls /tmp/core_*
     @{core_list} =  Split String    ${core_files}
     # Copy the core files
     Open Connection for SCP