Add password 'presence of' validation condition, to check only when password changed
Add password 'presence of' validation condition, to check only when password changed

rwehresmann/farma_alg_reborn,rwehresmann/farma_alg_reborn,rwehresmann/farma_alg_reborn,rwehresmann/farma_alg_reborn,rwehresmann/farma_alg_reborn