PHPC-408: Ensure object_to_bson() always creates a BSON document

Author: jmikola

src/bson.c

@@ -717,6 +717,11 @@ void object_to_bson(zval *object, php_phongo_bson_flags_t flags, const char *key
 			return;
 		}
 	}
+
+	/* Even if we don't know how to encode the object, ensure that we at least
+	 * create an empty BSON document. */
+	bson_append_document_begin(bson, key, key_len, &child);
+	bson_append_document_end(bson, &child);
 }
 void phongo_bson_append(bson_t *bson, php_phongo_bson_flags_t flags, const char *key, long key_len, int entry_type, zval *entry TSRMLS_DC)
 {

tests/bson/bson-utcdatetime-001.phpt

@@ -51,8 +51,8 @@ Test#1 { "0" : { "$date" : 1416445411987 } }
 string(37) "{ "0" : { "$date" : 1416445411987 } }"
 string(37) "{ "0" : { "$date" : 1416445411987 } }"
 bool(true)
-Test#2 { }
-string(3) "{ }"
-string(3) "{ }"
+Test#2 { "0" : {  } }
+string(14) "{ "0" : {  } }"
+string(14) "{ "0" : {  } }"
 bool(false)
 ===DONE===