Typo in customer_tax_rule test

issue3194
review843002
(transplanted from 21635f565ee32a83d6ba14df6ca49ffc3d6325e5)

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extra : transplant_source : %21c_V%5E%E3%2A%83%D6%BA%14%DFl%A4%9F%FC%3Dc%25%E5
Fix invoice method computation for task without project

issue3175
review819002
(transplanted from 87f0ad1c2062f47b89e7baa895e1341cafe95f79)

--HG--
extra : transplant_source : %87%F0%AD%1C%20b%F4%7B%89%E7%BA%A8%95%E14%1C%AF%E9_y