[Bugfix] Fix incorrect resolving order for transformers fallback (#15279)

Signed-off-by: Isotr0py <2037008807@qq.com>

vllm/model_executor/models/registry.py

@@ -418,11 +418,13 @@ class _ModelRegistry:
         if not architectures:
             logger.warning("No model architectures are specified")
 
-        normalized_arch = []
-        for model in architectures:
-            if model not in self.models:
-                model = "TransformersModel"
-            normalized_arch.append(model)
+        # filter out support architectures
+        normalized_arch = list(
+            filter(lambda model: model in self.models, architectures))
+
+        # make sure Transformers fallback are put at the last
+        if len(normalized_arch) != len(architectures):
+            normalized_arch.append("TransformersModel")
         return normalized_arch
 
     def inspect_model_cls(