Allowing for empty deb version for ADTRAN OLT
Also avoiding logging if OLT does not provide usr/pwd

Change-Id: I1b895bb1350c8865129e76909db040606c9d3ce0
diff --git a/libraries/utils.robot b/libraries/utils.robot
index 3aaba81..475e220 100755
--- a/libraries/utils.robot
+++ b/libraries/utils.robot
@@ -967,6 +967,8 @@
         ${olt_user}    Evaluate    ${olts}[${I}].get("user")
         ${olt_pass}    Evaluate    ${olts}[${I}].get("pass")
         ${olt_ssh_ip}    Evaluate    ${olts}[${I}].get("sship")
+        Continue For Loop If    "${olt_user}" == "${None}"
+        Continue For Loop If    "${olt_pass}" == "${None}"
         Wait Until Keyword Succeeds    180s    10s    Execute Remote Command
         ...    printf '%s\n' '' '' '${message}' '' >> /var/log/openolt.log
         ...    ${olt_ssh_ip}    ${olt_user}    ${olt_pass}