Add a None type for the Iid class (when the iid is completely empty)

src/irc/iid.cpp

@@ -34,9 +34,10 @@ Iid::Iid(const std::string& iid, const Bridge *bridge)
 
 void Iid::set_type(const std::set<char>& chantypes)
 {
+  if (this->local.empty() && this->server.empty())
+    this->type = Iid::Type::None;
   if (this->local.empty())
     return;
-
   if (chantypes.count(this->local[0]) == 1)
     this->type = Iid::Type::Channel;
   else
@@ -105,6 +106,8 @@ namespace std {
     {
       if (iid.type == Iid::Type::Server)
         return iid.get_server();
+      else if (iid.get_local().empty() && iid.get_server().empty())
+        return {};
       else
         return iid.get_encoded_local() + iid.separator + iid.get_server();
     }

src/irc/iid.hpp

@@ -53,6 +53,7 @@ public:
       Channel,
       User,
       Server,
+      None,
   };
   static constexpr char separator[]{"%"};
   Iid(const std::string& iid, const std::set<char>& chantypes);

tests/iid.cpp

@@ -83,6 +83,12 @@ TEST_CASE("Iid creation")
     CHECK(iid6.get_local() == "##channel");
     CHECK(iid6.get_server() == "");
     CHECK(iid6.type == Iid::Type::Channel);
+
+    Iid iid7("", chantypes);
+    CHECK(std::to_string(iid7) == "");
+    CHECK(iid7.get_local() == "");
+    CHECK(iid7.get_server() == "");
+    CHECK(iid7.type == Iid::Type::None);
 }
 
 TEST_CASE("Iid creation in fixed_server mode")