Merge branch 'master' into rclee-async-setupupstream/rclee-async-setup

1 files changed, 10 insertions, 1 deletions

diff --git a/src/mbgl/util/token.hpp b/src/mbgl/util/token.hpp
index 149661e47e..dea12f9412 100644
--- a/src/mbgl/util/token.hpp
+++ b/src/mbgl/util/token.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <mbgl/util/optional.hpp>
+
 #include <map>
 #include <string>
 #include <algorithm>
@@ -25,7 +27,14 @@ std::string replaceTokens(const std::string &source, const Lookup &lookup) {
         if (pos != end) {
             for (brace++; brace != end && tokenReservedChars.find(*brace) == std::string::npos; brace++);
             if (brace != end && *brace == '}') {
-                result.append(lookup({ pos + 1, brace }));
+                std::string key { pos + 1, brace };
+                if (optional<std::string> replacement = lookup(key)) {
+                    result.append(*replacement);
+                } else {
+                    result.append("{");
+                    result.append(key);
+                    result.append("}");
+                }
                 pos = brace + 1;
             } else {
                 result.append(pos, brace);