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Review the following code diff in the file "g4f/providers/base_provider.py" and take the pull request title and description into account when writing the response.
  
Pull request title: [pull] main from xtekky:main
Pull request description:
---
See Commits and Changes for more details.

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---

Each line is prefixed by its number. Code to review:
```
2: 
3: import sys
4: import asyncio
5:+
6: from asyncio import AbstractEventLoop
7: from concurrent.futures import ThreadPoolExecutor
8: from abc import abstractmethod
9: from inspect import signature, Parameter
10: from typing import Callable, Union
11:+
12: from ..typing import CreateResult, AsyncResult, Messages
13: from .types import BaseProvider, FinishReason
14: from ..errors import NestAsyncioError, ModelNotSupportedError
19: else:
20:     from types import NoneType
21: 
22:+try:
23:+    import nest_asyncio
24:+    has_nest_asyncio = True
25:+except ImportError:
26:+    has_nest_asyncio = False
27:+try:
28:+    import uvloop
29:+    has_uvloop = True
30:+except ImportError:
31:+    has_uvloop = False
32:+
33: # Set Windows event loop policy for better compatibility with asyncio and curl_cffi
34: if sys.platform == 'win32':
35:     try:
44:     try:
45:         loop = asyncio.get_running_loop()
46:         # Do not patch uvloop loop because its incompatible.
-        try:
-            import uvloop
47:+        if has_uvloop:
48:             if isinstance(loop, uvloop.Loop):
-                return loop
-        except (ImportError, ModuleNotFoundError):
-            pass
-        if check_nested and not hasattr(loop.__class__, "_nest_patched"):
-            try:
-                import nest_asyncio
49:+               return loop
50:+        if not hasattr(loop.__class__, "_nest_patched"):
51:+            if has_nest_asyncio:
52:                 nest_asyncio.apply(loop)
-            except ImportError:
-                raise NestAsyncioError('Install "nest_asyncio" package')
53:+            elif check_nested:
54:+                raise NestAsyncioError('Install "nest_asyncio" package | pip install -U nest_asyncio')
55:         return loop
56:     except RuntimeError:
57:         pass
163:         Returns:
164:             CreateResult: The result of the completion creation.
165:         """
-        get_running_loop(check_nested=True)
166:+        get_running_loop(check_nested=False)
167:         yield asyncio.run(cls.create_async(model, messages, **kwargs))
168: 
169:     @staticmethod
217:         Returns:
218:             CreateResult: The result of the streaming completion creation.
219:         """
-        loop = get_running_loop(check_nested=True)
220:+        loop = get_running_loop(check_nested=False)
221:         new_loop = False
222:         if loop is None:
223:             loop = asyncio.new_event_loop()
231:             while True:
232:                 yield loop.run_until_complete(await_callback(gen.__anext__))
233:         except StopAsyncIteration:
-            ...
234:+            pass
235:         finally:
236:             if new_loop:
237:                 loop.close()
257:             str: The created result as a string.
258:         """
259:         return "".join([
-            chunk async for chunk in cls.create_async_generator(model, messages, stream=False, **kwargs) 
260:+            str(chunk) async for chunk in cls.create_async_generator(model, messages, stream=False, **kwargs) 
261:             if not isinstance(chunk, (Exception, FinishReason))
262:         ])
263: 
```