Infinite list updates data extra time

### Issue type

**I'm submitting a ...** (check one with "x")

* [ x] bug report
* [ ] feature request

### Issue description

**Current behavior:**

When it receives just a few items and it's not enough for displaying scroll
then list triggers event for getting next batch of data. In case of search logic, we will see not relevant data

**Expected behavior:**

Infinite list should not trigger a new update event

**Steps to reproduce:**

**Related code:**

```
const distanceToBottom = scrollHeight - scrollTop - clientHeight;
```

### Other information:

**npm, node, OS, Browser**
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**Angular, Nebular**
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