[LyX/master] Fix \@ifundefined check for covexample(s)

[Juergen Spitzmueller]

commit 1720498f8d5270c9707efd4ab27e998006654d01
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Fri Aug 26 10:45:15 2016 +0200

    Fix \@ifundefined check for covexample(s)
    
    Fixes: #10340
---
 lib/layouts/linguistics.module |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/layouts/linguistics.module b/lib/layouts/linguistics.module
index a3a4002..c2f3df1 100644
--- a/lib/layouts/linguistics.module
+++ b/lib/layouts/linguistics.module
@@ -35,7 +35,7 @@ Style Numbered_Example_(multiline)
        % This code can be removed eventually
        \@ifundefined{covexample}{%
            \newenvironment{covexample}{\begin{example}}{\end{example}}%
-       }
+       }{}
        EndPreamble
        Category              Linguistics
 End
@@ -56,7 +56,7 @@ Style Numbered_Examples_(consecutive)
        % This code can be removed eventually
        \@ifundefined{covexamples}{%
            \newenvironment{covexamples}{\begin{examples}}{\end{examples}}%
-       }
+       }{}
        EndPreamble
 End