new: [gogocarto] don't fail on improper source code directory

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

gogocarto/lib/common

@@ -8,13 +8,13 @@ GOGOCARTO_URL=https://docker.0k.io/downloads/gogocarto-"${GOGOCARTO_RELEASE}".ta
 
 gogocarto:init() {
     current_version=""
-    if [ -d "${GOGOCARTO_CODE}" ]; then
-        current_version=$(cat "${GOGOCARTO_CODE}"/.version) || {
-            err "Couldn't find ${GOGOCARTO_CODE}/.version file."
-            echo "  Your config dir is in a broken state." >&2
-            return 1
-        }
-    else
+    if [ -e "${GOGOCARTO_CODE}/.version" ]; then
+        current_version="$(cat "${GOGOCARTO_CODE}/.version")" || return 1
+    fi
+
+    ## Note: previous content will be removed, if not in `.git` and no
+    ## version matching current one
+    if ! [ -d "${GOGOCARTO_CODE}/.git" ]; then
         mkdir -p "${GOGOCARTO_CODE}" &&
             cd "${GOGOCARTO_CODE}" &&
             git init . &&