Return treated data even after corrupt threshold

lib/persistence.js

@@ -214,18 +214,16 @@ class Persistence {
 
     lineStream.on('end', () => {
       // A bit lenient on corruption
+      let err = null
       if (length > 0 && corruptItems / length > this.corruptAlertThreshold) {
-        const corruptPercent = Math.floor(100 * this.corruptAlertThreshold)
-        const err = new Error(`More than ${corruptPercent}% of the data file is corrupt, the wrong beforeDeserialization hook may be used. Cautiously refusing to start NeDB to prevent dataloss`)
-        cb(err, null)
-        return
+        err = new Error(`More than ${Math.floor(100 * this.corruptAlertThreshold)}% of the data file is corrupt, the wrong beforeDeserialization hook may be used. Cautiously refusing to start NeDB to prevent dataloss`)
       }
 
       Object.keys(dataById).forEach(function (k) {
         tdata.push(dataById[k])
       })
 
-      cb(null, { data: tdata, indexes: indexes })
+      cb(err, { data: tdata, indexes: indexes })
     })
 
     lineStream.on('error', function (err) {