Pointer to TType is NULL on shader reflection for pipe output.

The following code
```
for (int j = 0; j < program.getNumPipeOutputs(); j++) {
if (program.getPipeOutput(i).getType()->getQualifier().hasLocation()) {

```
crashes on null getType().
For this shader:
```
layout (location = 0) out vec4 uFragColor;
void main() { uFragColor=vec4(1.0); }
```
I want to obtain the layout locations for the fragment outputs, but seems to be not possible

Reproduce the shader-reflection crash with the provided fragment shader and the loop over pipe outputs, starting from getPipeOutput() and getType(). Determine why the pipe output has no type and whether reflection can expose its layout location; done means the null dereference is addressed and the location can be obtained or the limitation is clearly defined.

Written by the indexing model from the issue text.