t.rast.mapcalc: TypeError: object of type 'NoneType' has no len()

[martinl]

I have two spatial-temporal datasets: tp2 and tp5. t.rast.mapcalc works when using one dataset:

t.rast.mapcalc in=tp5 exp="tp5 < 40" out=water basename=water --o

But combination of two datasets fails:

t.rast.mapcalc in=tp2,tp5 exp="tp5 < 40 || tp2 < 40" out=water basename=water --o

with

ERROR: The temporal map type of the sample dataset must be interval
    main()
  File "/opt/src/grass72_release/dist.x86_64-pc-linux-gnu/scripts/t.rast.mapcalc", line 95, in main
    base, method, nprocs, register_null, spatial)
  File "/opt/src/grass72_release/dist.x86_64-pc-linux-gnu/etc/python/grass/temporal/mapcalc.py", line 122, in dataset_mapcalculator
    if not list and len(list) == 0:
TypeError: object of type 'NoneType' has no len()

[martinl]

attachment:patch_3214.diff​ seems to fix this issue.

[martinl]

In 70001:

t.rast.mapcalc: TypeError: object of type 'NoneType' has no len() (see #3214)

[martinl]

In 70002:

t.rast.mapcalc: TypeError: object of type 'NoneType' has no len() (fixes #3214)