Template:!

| this is a dummy-template to allow if-conditions in wiki tables.

{!} replaces your | in #if: conditions.

example:

{|
{{#if:{{{foobar|}}}|
{{!}}-
! FooBar
{{!}} {{{foobar}}}
}}
|}

for foobar="barfoo" this will result in:

{|
|-
! FooBar
| barfoo
|}