Fix Platypus template when there are no inputs (additional one) (#2297)

PR is doing the same thing as #2296 (just in one more location in the codebase which I have missed in the first pass)

Co-authored-by: dbogunowicz <[email protected]>

src/sparseml/transformers/finetune/data/open_platypus.py

@@ -56,7 +56,7 @@ def get_raw_dataset(self, cache_dir: Optional[str] = None):
 
         # helper fn for restructuring each dataset entry using the alpaca template
         def restructure_fn(sample):
-            if "input" in sample:
+            if "input" in sample and sample["input"] != "":
                 sample["text"] = self.ALPACA_TEMPLATE["prompt_input"].format(
                     instruction=sample["instruction"], input=sample["input"]
                 )