GH-2277 fix even more exception catches by value

api/logic/Json.h

@@ -123,7 +123,7 @@ T ensureIsType(const QJsonValue &value, const T default_ = T(), const QString &w
 	{
 		return requireIsType<T>(value, what);
 	}
-	catch (JsonException)
+	catch (const JsonException &)
 	{
 		return default_;
 	}

libraries/classparser/src/classparser.cpp

@@ -70,7 +70,7 @@ QString GetMinecraftJarVersion(QString jarName)
 			}
 		}
 	}
-	catch (java::classfile_exception) { }
+	catch (const java::classfile_exception &) { }
 
 	// clean up
 	delete[] classfile;