handle null (#1135)

Bypassing as this is blocking ATS runs. Simple fix to make sideband_port optional config.

Author: amehra-ni

source/server/server_configuration_parser.cpp

@@ -144,7 +144,12 @@ int ServerConfigurationParser::parse_max_message_size() const
 
 int ServerConfigurationParser::parse_sideband_port() const
 {
-  return parse_port_with_key(kSidebandPortJsonKey);
+  try {
+    return parse_port_with_key(kSidebandPortJsonKey);
+  }
+  catch (const UnspecifiedPortException&) {
+    return DEFAULT_SIDEBAND_PORT;
+  }
 }
 
 FeatureToggles ServerConfigurationParser::parse_feature_toggles() const

source/server/server_configuration_parser.h

@@ -23,6 +23,7 @@ static const char* kInvalidFeatureToggleMessage = "Feature Toggles must be speci
 static const char* kInvalidCodeReadinessMessage = "code_readiness must be a string in [Release, RestrictedRelease, NextRelease, RestrictedNextRelease, Incomplete, Prototype].\n\n";
 static const char* kDefaultAddress = "[::]";
 constexpr int UNLIMITED_MAX_MESSAGE_SIZE = -1;
+constexpr int DEFAULT_SIDEBAND_PORT = 50055;
 
 class ServerConfigurationParser {
  public: