Merge branch 'git-hash-check' into 'master'

Hiding git error when not in a repo

See merge request !402

Makefile.in

@@ -9,7 +9,7 @@ models_dir:= $(bld_dir)/models
 bld_utils_dir:= $(bld_dir)/utils
 linux_version := '@linux_version@'
 VPATH=$(srcdir)
-IS_RCG_SRC_GIT_REPO:= $(shell (cd $(srcdir) && git rev-parse --is-inside-work-tree))
+IS_RCG_SRC_GIT_REPO:= $(shell (cd $(srcdir) && git rev-parse --is-inside-work-tree 2>/dev/null))
 
 prefix      = @prefix@
 exec_prefix = @exec_prefix@