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The templates{{Error if empty}}, and{{If then verbatim else error}} are used to avoid unwanted transclusions of the{{Error}} template in the cases in which the {{#if}} (or a similar) parser function is not directly used for determining the error conditions. In these cases, these templates will appearpermanently transcluded instead of{{Error}}.
This template checks whether the first parameter is empty. If it is, it redirects all other parameters, shifted, to{{Error}}. If it is not, it displays the second parameter, preserving trailing and leading spaces.
→{{If then verbatim else error|Hello world| Foobar|Error: Lorem ipsum dolor sit amet.}}←→{{If then verbatim else error|| Foobar|Error: Lorem ipsum dolor sit amet.}}←→{{If then verbatim else error|| Foobar|Error: Lorem ipsum dolor sit amet.}}←→{{If then verbatim else error|| Foobar}}←→{{If then verbatim else error}}←