fix #622 - we might not have a local position yet early in the boot

src/plugins/PositionPlugin.cpp

@@ -31,10 +31,16 @@ MeshPacket *PositionPlugin::allocReply()
 {
     NodeInfo *node = nodeDB.getNode(nodeDB.getNodeNum());
     assert(node);
-    assert(node->has_position);
+
+    // We might not have a position yet for our local node, in that case, at least try to send the time
+    if(!node->has_position) {
+        memset(&node->position, 0, sizeof(node->position));
+        node->has_position = true;
+    }
+    
+    Position &position = node->position;
 
     // Update our local node info with our position (even if we don't decide to update anyone else)
-    auto position = node->position;
     position.time = getValidTime(RTCQualityGPS); // This nodedb timestamp might be stale, so update it if our clock is valid.
 
     return allocDataProtobuf(position);