The feature is available since V5.3.7:
storeText / storeValue / storeChecked / storeAttribute changed behavior:
Now, if the locator can not be found, no error is triggered but (only) a warning is logged and !statusOK is set to “false”. This is the same error behavior as all the Selenium verify... commands that we implemented.
In addition, the variable (in the value column) gets filled with the string #LNF which stands for “Locator not found”. This way the variable is defined even if the locator was not found.