Bug when filling trace_ch field in TADC tree

[pcorcam]

Likely location of bug: /grand/dataio/root_trees.py

There is a bug when one tries to assign a value to trace_ch in a TADC tree. If you try to assign tadc.trace_ch = [my_trace_list], you get a very long error message that starts with:

*** Error in `python3': munmap_chunk(): invalid pointer: 0x000055bcdc9d65b0 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x7f474)[0x7fc44b063474]
[0x7fc38e68210e]
[0x7fc38e68230f]
[0x7fc38e68208e]
[0x7fc38e682284]
...

This is the same error one might encounter when using tadc.copy_contents(). However, tadc.trace_ch = np.array([my_trace_list]) DOES work. Hopefully this can help to solve this issue.

Note that there is no issue when assigning values to other TADC attributes, it's only a problem for tadc.trace_ch. Not checked for trace properties in other TTrees.