Fix viewing polls with no voters_count key

https://estrogen.network/@froggo/9igjsqqhxhsgtu4q

models.cpp

@@ -80,9 +80,13 @@ void from_json(const json& j, PollOption& option) {
 }
 
 void from_json(const json& j, Poll& poll) {
-    poll.expires_at = parse_rfc3339(j.at("expires_at").get_ref<const std::string&>());
+    if (!j.at("expires_at").is_null()) {
+        poll.expires_at = parse_rfc3339(j["expires_at"].get_ref<const std::string&>());
+    } else {
+        poll.expires_at = -1;
+    }
     j.at("expired").get_to(poll.expired);
-    if (!j.at("voters_count").is_null()) {
+    if (j.contains("voters_count") && !j["voters_count"].is_null()) {
         j.at("voters_count").get_to(poll.voters_count);
     } else {
         poll.voters_count = -1;

models.h

@@ -64,7 +64,7 @@ struct PollOption {
     uint64_t votes_count;
 };
 struct Poll {
-    time_t expires_at;
+    time_t expires_at; // negative if none
     bool expired;
     int64_t voters_count; // negative if unknown
     uint64_t votes_count;

servehelper.cpp

@@ -495,11 +495,10 @@ static inline Element serialize_poll(const httplib::Request& req, const Poll& po
         ? std::vector<Node>({std::to_string(voters_count), " ", pick_form(voters_count, "voter", "voters")})
         : std::vector<Node>({std::to_string(poll.votes_count), " ", pick_form(poll.votes_count, "vote", "votes")})
     );
-    p.nodes.push_back(" / ");
     if (poll.expired) {
-        p.nodes.push_back("Expired");
+        p.nodes.push_back(" / Expired");
-    } else {
+    } else if (poll.expires_at >= 0) {
-        p.nodes.push_back("Expires in ");
+        p.nodes.push_back(" / Expires in ");
         p.nodes.push_back(relative_time(current_time(), poll.expires_at));
     }
     div.nodes.push_back(std::move(p));