Fabian Homborg 39a601927f Remove useless empty lines from stack traces
This printed things like

```
in function 'f'
        called on standard input

in function 'd'
        called on standard input

in function 'b'
        called on standard input

in function 'a'
        called on standard input

```

As a first step, it removes the empty lines so it's now

```
in function 'f'
        called on standard input
in function 'd'
        called on standard input
in function 'b'
        called on standard input
in function 'a'
        called on standard input
```

See #5434.
2019-03-26 16:47:42 +01:00
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