Add a conditional if/else for vin being empty or null

cli_demo.py

@@ -5,19 +5,23 @@ def main():
     keep_searching = True
     while keep_searching:
         vin = input("Please enter a valid VIN or 0 (zero) to exit: \n").strip()
-        year, make, model = nhtsa_api_call.get_vehicle_info(vin)
-        if year and make and model:
-            print(f"✅ VIN {vin}")
-            print(f"   Year: {year}")
-            print(f"   Make: {make}")
-            print(f"   Model: {model}")
+        if vin == "" or vin == None: 
             keep_searching = True
-        elif vin == "0":
-            keep_searching = False
-            break
+            continue
         else:
-            print(f"❌ VIN {vin} not found in database. Try again.")
-            keep_searching = True
+            year, make, model = nhtsa_api_call.get_vehicle_info(vin)
+            if year and make and model:
+                print(f"✅ VIN {vin}")
+                print(f"   Year: {year}")
+                print(f"   Make: {make}")
+                print(f"   Model: {model}")
+                keep_searching = True
+            elif vin == "0":
+                keep_searching = False
+                break
+            else:
+                print(f"❌ VIN {vin} not found in database. Try again.")
+                keep_searching = True
 
 if __name__ == "__main__":
     main()