be ready method can throw unchecked exceptions, e.g. PCE in highlighting - to fix EA-98206 - AUCRRAE: ReadMostlyRWLock.a

platform/util/src/com/intellij/util/xmlb/PropertyAccessor.java

@@ -61,6 +61,9 @@ class PropertyAccessor implements MutableAccessor {
       throw new XmlSerializationException(e);
     }
     catch (InvocationTargetException e) {
+      Throwable exception = e.getTargetException();
+      if (exception instanceof Error) throw (Error)exception;
+      if (exception instanceof RuntimeException) throw (RuntimeException)exception;
       throw new XmlSerializationException(e);
     }
   }