Make fewer assumptions about config state

This handles values missing when config is created through RouterHive.

llarp/router/router.cpp

@@ -457,7 +457,7 @@ namespace llarp
 
     // if our conf had no bootstrap files specified, try the default location of
     // <DATA_DIR>/bootstrap.signed. If this isn't present, leave a useful error message
-    if (configRouters.size() == 0)
+    if (configRouters.size() == 0 and not m_isServiceNode)
     {
       // TODO: use constant
       fs::path defaultBootstrapFile = conf->router.m_dataDir / "bootstrap.signed";

llarp/util/logging/logger.cpp

@@ -108,7 +108,7 @@ namespace llarp
     nodeName = nickname;
 
     FILE* logfile = nullptr;
-    if (file == "stdout")
+    if (file == "stdout" or file.empty())
     {
       logfile = stdout;
     }
@@ -125,7 +125,7 @@ namespace llarp
     switch (type)
     {
       case LogType::Unknown:
-        throw std::invalid_argument("Cannot use LogType::Unknown");
+        // tolerate as fallback to LogType::File
 
       case LogType::File:
         if (logfile != stdout)