Fix logical error in postprocess_results()

The intention was to return no more than MAX_RESULTS, not to always
return that much.

This resulted in returning bogus empty strings in case of no matches and
consequent pre-translation matching with empty fuzzy strings.

Fixes ec6f6df.

Author: vslavik

src/tm/transmem.cpp

@@ -365,7 +365,8 @@ std::wstring get_text_field(DocumentPtr doc, const std::wstring& field)
 void postprocess_results(SuggestionsList& results)
 {
     std::stable_sort(results.begin(), results.end());
-    results.resize(MAX_RESULTS);
+    if (results.size() > MAX_RESULTS)
+        results.resize(MAX_RESULTS);
 }