Fix autotest build if poppler is not installed

autotests/CMakeLists.txt

@@ -12,6 +12,11 @@ if(Poppler_Qt5_FOUND)
         TEST_NAME "parttest"
         LINK_LIBRARIES Qt5::Widgets Qt5::Test Qt5::Xml okularcore okularpart
     )
+
+    ecm_add_test(visibilitytest.cpp
+        TEST_NAME "visibilitytest"
+        LINK_LIBRARIES Qt5::Widgets Qt5::Test okularcore
+    )
 endif()
 
 ecm_add_test(documenttest.cpp
@@ -64,11 +69,6 @@ ecm_add_test(calculatetexttest.cpp
     LINK_LIBRARIES Qt5::Widgets Qt5::Test okularcore
 )
 
-ecm_add_test(visibilitytest.cpp
-    TEST_NAME "visibilitytest"
-    LINK_LIBRARIES Qt5::Widgets Qt5::Test okularcore
-)
-
 if(KF5Activities_FOUND)
 	ecm_add_test(mainshelltest.cpp ../shell/okular_main.cpp ../shell/shellutils.cpp ../shell/shell.cpp
 		TEST_NAME "mainshelltest"