Tree: Use unwrap and coalesce for optional handling

Python doesn't have proper handling of optionals. The only way to
handle them is checking via an if statement if the value is None or
by using the "or" keyword to unwrap optionals.

Previously, I used the "or" method to unwrap, but this caused issues
due to falsy values falling back to the default. This is especially
the case with booleans were "False" changed to "True".

Instead, add two new functions: unwrap and coalesce. Both function
to properly implement a functional way of "None" coalescing.

Signed-off-by: kingbri <bdashore3@proton.me>

OAI/types/common.py

@@ -1,5 +1,6 @@
 from pydantic import BaseModel, Field
 from typing import List, Dict, Optional, Union
+from utils import coalesce
 
 class LogProbs(BaseModel):
     text_offset: List[int] = Field(default_factory=list)
@@ -83,7 +84,7 @@ class CommonCompletionRequest(BaseModel):
             "min_p": self.min_p,
             "tfs": self.tfs,
             "repetition_penalty": self.repetition_penalty,
-            "repetition_range": self.repetition_range or self.repetition_penalty_range or -1,
+            "repetition_range": coalesce(self.repetition_range, self.repetition_penalty_range, -1),
             "repetition_decay": self.repetition_decay,
             "mirostat": self.mirostat_mode == 2,
             "mirostat_tau": self.mirostat_tau,