sap_swpm: fix issue sap-linuxlab#792 - error when observer user defin…

…ed, but empty and observe mode is on

roles/sap_swpm/tasks/pre_install.yml

@@ -18,7 +18,7 @@
 - name: SAP SWPM Pre Install - Set sapinst command
   vars:
     sap_swpm_swpm_command_guiserver: "{{ 'SAPINST_START_GUISERVER=false' if not sap_swpm_swpm_observer_mode else '' }}"
-    sap_swpm_swpm_command_observer: "{{ 'SAPINST_REMOTE_ACCESS_USER=' + sap_swpm_swpm_remote_access_user + ' SAPINST_REMOTE_ACCESS_USER_IS_TRUSTED=true' if sap_swpm_swpm_observer_mode and sap_swpm_swpm_remote_access_user is defined and sap_swpm_swpm_remote_access_user | length > 0 else '' }}"
+    sap_swpm_swpm_command_observer: "{{ 'SAPINST_REMOTE_ACCESS_USER=' + sap_swpm_swpm_remote_access_user + ' SAPINST_REMOTE_ACCESS_USER_IS_TRUSTED=true' if sap_swpm_swpm_observer_mode and sap_swpm_swpm_remote_access_user | d('',true) | length > 0  else '' }}" 
   ansible.builtin.set_fact:
     sap_swpm_swpm_command_inifile: "SAPINST_INPUT_PARAMETERS_URL={{ sap_swpm_tmpdir.path }}/inifile.params"
     sap_swpm_swpm_command_product_id: "SAPINST_EXECUTE_PRODUCT_ID={{ sap_swpm_product_catalog_id }}"