[bug] exclude_patterns shouldn't be empty and repeated

[Freed-Wu]

? Would you like to add any exclude patterns? Yes
? Select exclude pattern
? Add more exclude patterns? Yes
? Select exclude pattern
? Add more exclude patterns? Yes
? Select exclude pattern
? Add more exclude patterns? No

Result:

exclude_patterns = ["", "", ""]

Expected:

? Would you like to add any exclude patterns? Yes
? Select exclude pattern
? exclude pattern shouldn't be empty string
? Select exclude pattern a
? Add more exclude patterns? Yes
? Select exclude pattern a
? exclude pattern shouldn't be repeated