feat: Non-zero Default Fees

server/config/config.go

@@ -307,6 +307,10 @@ func GetConfig(v *viper.Viper) Config {
 	}
 }
 
-func (c Config) ValidateBasic() bool {
-	return c.BaseConfig.MinGasPrices != ""
+func (c Config) ValidateBasic() error {
+	if c.BaseConfig.MinGasPrices == "" {
+		return fmt.Errorf("Please set min gas price in app.toml or flag or env var")
+	}
+
+	return nil
 }

server/start.go

@@ -274,8 +274,8 @@ func startInProcess(ctx *Context, clientCtx client.Context, appCreator types.App
 	ctx.Logger.Debug("initialization: tmNode started")
 
 	config := config.GetConfig(ctx.Viper)
-	if !config.ValidateBasic() {
-		return fmt.Errorf("MinGasPrices is not empty")
+	if err := config.ValidateBasic(); err != nil  {
+		return err
 	}
 
 	// Add the tx service to the gRPC router. We only need to register this