Empty config value is not replaced by default value #380 (#381)

server/src/config.ts

@@ -37,7 +37,7 @@ export const ZMQ_CONNECTION_STRING = createZMQConnectionString();
 
 
 function getConfigField(field: string, defaultVal?: any) {
-  let val = defaultVal;
+  let val;
 
   if(process.env[field] !== undefined) {
     val = process.env[field];
@@ -50,8 +50,11 @@ function getConfigField(field: string, defaultVal?: any) {
   }
 
   if(val === undefined || val == '') {
+    if(defaultVal === undefined) {
       throw new Error(`Please configure ${field}`);
     }
+    return defaultVal;
+  }
   return val;
 }