message: Make sure to install crystals directory even when it exists
  Fixes - thanks to
diff: @@ -45,8 +45,9 @@ ExternalProject_Add(crystals
  BUILD_COMMAND ""
  INSTALL_COMMAND ""
  )
  +endif()
  +
  install(DIRECTORY "${AvogadroLibs_SOURCE_DIR}/../crystals"
  DESTINATION "${INSTALL_DATA_DIR}/avogadro2"
  PATTERN ".git" EXCLUDE
  )
  -endif()
  \ No newline at end of file
  