[pitivi] tests: Fix nosetests being required

[Alexandru Băluț <alexbalut src gnome org>]

commit 68a54ccdbf92d112b28d695d0b6059825570d50d
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Sun Aug 14 16:34:01 2016 +0200

    tests: Fix nosetests being required

 tests/meson.build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/tests/meson.build b/tests/meson.build
index 02d92ae..b094902 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -1,7 +1,7 @@
 runtests = find_program('nosetests3', required : false)
 # On some distros it doesn't have the '3' suffix
 if not runtests.found()
-    runtests = find_program('nosetests')
+    runtests = find_program('nosetests', required : false)
 endif
 
 testdir = '@0@'.format(meson.current_source_dir())