fixed case with no surfers

app.py

@@ -15,10 +15,11 @@ FPS = 2
 PLAYLIST_URL = (
     "https://live.hdontap.com/hls/hosb1/topanga_swellmagnet.stream/playlist.m3u8"
 )
-API_KEY = os.environ["API_KEY"]
-ENDPOINT_ID = os.environ["ENDPOINT_ID"]
+# API_KEY = os.environ["API_KEY"]
+# ENDPOINT_ID = os.environ["ENDPOINT_ID"]
 
 
+print(st.theme())
 render_svg(Path("./assets/landing-logo.svg").read_text())
 st.title("Topanga Beach Surfer Counter")
 st.write(
@@ -39,7 +40,11 @@ def get_latest_surfer_count():
             break
         frs.extend(frame.run_predict(predictor=surfer_model).overlay_predictions())
     frs.save_video(str(VIDEO_CACHE_PATH), video_fps=FPS, image_src="overlay")
-    surfers = frs.get_class_counts()["surfer"] / (VIDEO_LEN_SEC * FPS)
+    counts = frs.get_class_counts()
+    if "surfer" in counts:
+        surfers = frs.get_class_counts()["surfer"] / (VIDEO_LEN_SEC * FPS)
+    else:
+        surfers = 0
     st.video(open(VIDEO_CACHE_PATH, "rb").read())
     st.write(f"Surfer count: **{surfers}**")