don't let semver failures abort the whole buildpack

bin/compile

@@ -66,7 +66,8 @@ function resolve_version() {
     args=""
     for version in $available_versions; do args="${args} -v \"${version}\""; done
     for version in $requested_version; do args="${args} -r \"${version}\""; done
-    eval $bootstrap_node/bin/node $LP_DIR/vendor/node-semver/bin/semver ${args} | tail -n1
+    evaluated_version=$(eval $bootstrap_node/bin/node $LP_DIR/vendor/node-semver/bin/semver ${args} || echo "")
+    echo "$evaluated_version" | tail -n 1
   fi
 }