Fully init OurReader

See open-source-parsers#363, similar to open-source-parsers#364.

Author: cdunn2001

src/lib_json/json_reader.cpp

@@ -1031,7 +1031,9 @@ class OurReader {
 
 OurReader::OurReader(OurFeatures const& features)
     : errors_(), document_(), begin_(), end_(), current_(), lastValueEnd_(),
-      lastValue_(), commentsBefore_(), features_(features), collectComments_() {
+      lastValue_(), commentsBefore_(),
+      stackDepth_(0),
+      features_(features), collectComments_() {
 }
 
 bool OurReader::parse(const char* beginDoc,