Implement #404 to solve #435 (gtest not found)

Author: facontidavide

CMakeLists.txt

@@ -121,8 +121,9 @@ elseif( CATKIN_DEVEL_PREFIX OR CATKIN_BUILD_BINARY_PACKAGE)
 
     list(APPEND BEHAVIOR_TREE_PUBLIC_LIBRARIES ${catkin_LIBRARIES})
     set(BUILD_TOOL_INCLUDE_DIRS ${catkin_INCLUDE_DIRS})
+endif()
 
-elseif(BTCPP_UNIT_TESTS)
+if(BTCPP_UNIT_TESTS)
     if(${CMAKE_VERSION} VERSION_LESS "3.11.0")
         find_package(GTest REQUIRED)
     else()