Fix accessing non allocated array in prep

[addman2]

Prep was asking for a size of non allocated array.

Fix #50

[kousuke-nakano]

Dear @addman2 thanks! It is surprising that I have never notice it... I did not see any complaint. So, it means that compilers automatically allocate the (non-allocated) array?

        if (ipc .eq. 1) then
               bdim = size(molecorbl, 1)
+             bdimdo = size(molecorbldo, 1)

[addman2]

I guess size was returning some random value. Since it was not used it did not produce any problems.

[kousuke-nakano]

Dear @addman2 thanks for the comment! It was not used in essential DFT parts?

[addman2]

Well, it was in essential part of prep but it did not affect any behaviour, because the variable with garbage data was not used

[kousuke-nakano]

Thanks @addman2!