refs #709, as result of testing created special database views for ICAO codes

* view already filter incomplete data
* as result, info object count values are aligned with data eventually parsed (which will allow to detect changes by comparing counts)
* smaller adjustments to allow airlines with designator

src/blackmisc/aviation/airlineicaocode.cpp

@@ -288,6 +288,7 @@ namespace BlackMisc
         QString CAirlineIcaoCode::getCombinedStringWithKey() const
         {
             QString s(getVDesignator());
+            if (s.isEmpty()) s = "????";
             if (hasName()) { s = s.append(" ").append(getName()); }
             return s.append(" ").append(getDbKeyAsStringInParentheses());
         }