Improve exception logging when serializing invalid pages

When a page has fewer channels then output columns, log the full stack
trace, and avoid producing an empty response. This makes debugging page
sources easier.

core/trino-main/src/main/java/io/trino/server/protocol/JsonArrayResultsIterator.java

@@ -113,9 +113,9 @@ private List<Object> getRowValues()
         List<Object> row = new ArrayList<>(columns.size());
         for (OutputColumn outputColumn : columns) {
             Type type = outputColumn.type();
-            Block block = currentPage.getBlock(outputColumn.sourcePageChannel());
 
             try {
+                Block block = currentPage.getBlock(outputColumn.sourcePageChannel());
                 Object value = type.getObjectValue(session.toConnectorSession(), block, inPageIndex);
                 if (!supportsParametricDateTime) {
                     value = getLegacyValue(value, type);