FindPETSc.cmake fails when PETSC_VERSION is not found

Trying to build FEniCS from source, Dolfin failed to build due to a configuration error:

-- Checking for one of the modules 'craypetsc_real;PETSc'
CMake Error at cmake/modules/FindPETSc.cmake:59 (string):
  string sub-command REPLACE requires at least four arguments.

This eventually aborts the installation process.

Debugging it, this is due to PETSC_VERSION being empty in my system, while the code in lines 59-62 assumes that a meaningful PETSC_VERSION is always returned. This can be fixed by surrounding these lines with an "if" so that they run only when PETSC_FOUND:

# Extract major, minor, etc from version string
if (PETSC_FOUND)
   string(REPLACE "." ";" VERSION_LIST ${PETSC_VERSION})
   list(GET VERSION_LIST 0 PETSC_VERSION_MAJOR)
   list(GET VERSION_LIST 1 PETSC_VERSION_MINOR)
   list(GET VERSION_LIST 2 PETSC_VERSION_SUBMINOR)
endif()

At the very least, I managed to build dolfin this way on my gentoo system.

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