Update app.py

app.py

@@ -14,7 +14,7 @@ import scipy.signal as sps
 from io_utils import read_audio_info, load_audio_mono
 from time_domain import compute_time_domain_stats
 from spectral import compute_spectral_analysis
-from loudness_calc import compute_loudness
+from loudness_calc import compute_loudness, LOUDNESS_AVAILABLE
 from issue_detection import detect_audio_issues
 from synthetic_detector import detect_synthetic_voice
 from report_generator import create_report