ci: don't fail on empty vis test suite

build-appveyor.ps1

@@ -46,7 +46,7 @@ if ( $? -eq $false ) {
   throw "testqbsp failed"
 }
 
-.\vis\Release\testvis.exe
+.\vis\Release\testvis.exe --allow-running-no-tests
 
 if ( $? -eq $false ) {
   throw "testvis failed"

build-linux-64.sh

@@ -40,7 +40,7 @@ cpack || exit 1
 ./common/testcommon || exit 1
 ./light/testlight || exit 1
 ./qbsp/testqbsp || exit 1
-./vis/testvis || exit 1
+./vis/testvis --allow-running-no-tests || exit 1
 
 # check rpath
 readelf -d ./light/light

build-osx.sh

@@ -54,4 +54,4 @@ otool -L ./bsputil/bsputil
 ./common/testcommon || exit 1
 ./light/testlight || exit 1
 ./qbsp/testqbsp || exit 1
-./vis/testvis || exit 1
+./vis/testvis --allow-running-no-tests || exit 1