Better quick fix to "Potential null pointer access": check if the variable is not null

I have the following code:

```java
String s = null;
// do conditional stuff with "s"
s.length() // "Potential null pointer access" warning
```
Currently VS Code offers me 2 quick fixes:
1. "Ignore compiler problem(s)"
2. "Add @SuppressWarnings 'null' to myMethod"

A better quick fix option would be to add a "not nulll" check before the method calling. 