ROS Cmake Error in lsb.cmake:8 (string): string no output variable specified

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When I am trying to compile a workspace using catkin_make I get a CMake error. I think that this has to do with the python installation. The catkin_make has compiled in the the past and I have not changed /opt/ros/indigo/share/catkin/cmake/platform/lsb.cmake. I am using ubuntu 14.04 and a ROS version of indigo. Does anyone else know where this problem is coming from?

The error occurs when I run:

~$ cd catkin_ws_working_copy
~/catkin_ws_working_copy$ catkin_make

I get this error:

 ####
    #### Running command: "make cmake_check_build_system" in "catkin_ws_working_copy/build"
    ####
    -- Using CATKIN_DEVEL_PREFIX: /catkin_ws_working_copy/devel
    -- Using CMAKE_PREFIX_PATH: /catkin_ws_working_copy/devel;/catkin_ws/devel;/sawyer_ros/devel;/opt/ros/indigo
    -- This workspace overlays: /catkin_ws_working_copy/devel;/catkin_ws/devel;/sawyer_ros/devel;/opt/ros/indigo
    -- Using PYTHON_EXECUTABLE: /usr/bin/python
    -- Using Debian Python package layout
    -- Using empy: /usr/bin/empy 

CMake Error at /opt/ros/indigo/share/catkin/cmake/platform/lsb.cmake:8 (string):   string no output variable specified Call Stack (most recent call first):   /opt/ros/indigo/share/catkin/cmake/all.cmake:147 (include)   /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:20 (include)   CMakeLists.txt:52 (find_package)


    CMake Error at /opt/ros/indigo/share/catkin/cmake/platform/lsb.cmake:21 (string):   string no output variable specified Call Stack (most recent call first):   /opt/ros/indigo/share/catkin/cmake/all.cmake:147 (include)   /opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:20 (include)   CMakeLists.txt:52 (find_package)

I have not changed the lsb.cmake file and it is below:

find_program(LSB_RELEASE_EXECUTABLE lsb_release)

if(LSB_RELEASE_EXECUTABLE)
  set(LSB_FOUND TRUE CACHE BOOL "lsb_release executable was found")
  execute_process(COMMAND ${LSB_RELEASE_EXECUTABLE} -si
    OUTPUT_VARIABLE LSB_DISTRIB_ID
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  string(TOUPPER ${LSB_DISTRIB_ID} v)
  set(${v} TRUE CACHE BOOL "LSB Distrib tag")

  execute_process(COMMAND ${LSB_RELEASE_EXECUTABLE} -sd
    OUTPUT_VARIABLE LSB_DESCRIPTION
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  execute_process(COMMAND ${LSB_RELEASE_EXECUTABLE} -sr
    OUTPUT_VARIABLE LSB_RELEASE
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  execute_process(COMMAND ${LSB_RELEASE_EXECUTABLE} -sc
    OUTPUT_VARIABLE LSB_CODENAME
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  string(TOUPPER ${LSB_DISTRIB_ID} v)
  set(${v} TRUE CACHE BOOL "LSB Distribution")
  #message(STATUS "${v} is on")

  string(TOUPPER ${LSB_DISTRIB_ID}_${LSB_CODENAME} v)
  set(${v} TRUE CACHE BOOL "LSB Distrib - codename tag")
  #message(STATUS "${v} is on")
endif()