Revert "cmd: provide feedback if OLLAMA_MODELS is set on non-serve command (#3470)" (#3662)

This reverts commit 7d05a6ee8f.

This proved to be more painful than useful.

See: https://github.com/ollama/ollama/issues/3624

cmd/cmd.go

@@ -252,14 +252,6 @@ func createBlob(cmd *cobra.Command, client *api.Client, path string) (string, er
 }
 
 func RunHandler(cmd *cobra.Command, args []string) error {
-	if os.Getenv("OLLAMA_MODELS") != "" {
-		return errors.New("OLLAMA_MODELS must only be set for 'ollama serve'")
-	}
-
-	if err := checkServerHeartbeat(cmd, args); err != nil {
-		return err
-	}
-
 	client, err := api.ClientFromEnvironment()
 	if err != nil {
 		return err
@@ -989,6 +981,7 @@ func NewCLI() *cobra.Command {
 		Use:     "run MODEL [PROMPT]",
 		Short:   "Run a model",
 		Args:    cobra.MinimumNArgs(1),
+		PreRunE: checkServerHeartbeat,
 		RunE:    RunHandler,
 	}