remove fatal error message from git revision when not in git

CMakeLists.txt

@@ -189,9 +189,11 @@ add_compile_options(${OPTIMIZE_FLAGS} ${CRYPTO_FLAGS})
 if(NOT GIT_VERSION)
   exec_program("git" ${CMAKE_CURRENT_SOURCE_DIR} ARGS "rev-parse --short HEAD" OUTPUT_VARIABLE GIT_VERSION_UNSTRIP)
   string(STRIP "${GIT_VERSION_UNSTRIP}" GIT_VERSION)
-  add_definitions("-DGIT_REV=\"${GIT_VERSION}\"")
 endif(NOT GIT_VERSION)
 
+string(REGEX REPLACE ^fatal.*$ nogit GIT_VERSION_REAL "${GIT_VERSION}")
+add_definitions("-DGIT_REV=\"${GIT_VERSION_REAL}\"")
+
 set(EXE lokinet)
 set(EXE_SRC daemon/main.cpp)