fix: node fetching error handling

lib/plugins/common/json-rpc.js

@@ -7,6 +7,7 @@ const request = require('request-promise')
 const { utils: coinUtils } = require('@lamassu/coins')
 
 const options = require('../../options')
+const logger = require('../../logger')
 
 const blockchainDir = options.blockchainDir
 
@@ -116,6 +117,9 @@ function rpcConfig (cryptoRec) {
       port: config.rpcport || cryptoRec.defaultPort
     }
   } catch (err) {
-    throw new Error('Wallet is currently not installed')
+    logger.error('Wallet is currently not installed!')
+    return {
+      port: cryptoRec.defaultPort
+    }
   }
 }