Disable auto replaces that match an empty string.

Some people are having problems with these suddenly showing up and making typing impossible. This doesn't fix the cause of the ARs appearing, but it at least prevents it from making MSE unusable.

src/data/word_list.cpp

@@ -49,3 +49,9 @@ IMPLEMENT_REFLECTION_NO_SCRIPT(AutoReplace) {
   REFLECT(match);
   REFLECT(replace);
 }
+
+void after_reading(AutoReplace& ar, Version) {
+  if (ar.match.empty()) {
+    ar.enabled = false;
+  }
+}

src/data/word_list.hpp

@@ -58,3 +58,5 @@ public:
   DECLARE_REFLECTION();
 };
 
+void after_reading(AutoReplace& ar, Version);
+