RIS format ER tag

[igordot]

There seems to be an issue with the RIS format export. According to the RefDB handbook: The last tag of each reference is the End tag (ER - ). Clarivate EndNote has a similar comment: ... the last tag of each reference, which must be "ER - ," ....

In cffconvert, the ER - tag is only ER:

cffconvert/src/cffconvert/lib/cff_1_x_x/ris.py

Line 34 in b6045d7

return "TY - GEN\n" + "".join(items) + "ER\n"

At least with EndNote, those RIS files are not imported properly.