A Study to Test Whether BI 685509 Alone or in Combination With Empagliflozin Helps People With Liver Cirrhosis Caused by Viral Hepatitis or Non-alcoholic Steatohepatitis (NASH) Who Have High Blood Pressure in the Portal Vein (Main Vessel Going to the Liver)

Inclusion Criteria: * Signed and dated written informed consent in accordance with ICH-GCP and local legislation prior to admission to the trial * Male or female who is ≥ 18 (or who is of legal age in countries where that is greater than 18) and ≤ 75 years old at screening (Visit 1a) * Clinical signs of Clinically Significant Portal Hypertension (CSPH) as described by either one of the points below. Each trial patient must have a gastroscopy during the screening period (Visit 1b) or within 6 months prior to screening (Visit 1b). * documented endoscopic proof of oesophageal varices and / or gastric varices at screening (Visit 1b) or within 6 months prior to screening (Visit 1b) * documented endoscopic-treated oesophageal varices as preventative treatment * CSPH defined as baseline Hepatic Venous Pressure Gradient (HVPG) ≥ 10 mmHg (measured at Visit 1c), based on a local interpretation of the pressure tracing * Diagnosis of compensated cirrhosis due to Hepatitis C virus (HCV), Hepatitis B virus (HBV), or Non-Alcoholic Steatohepatitis (NASH) with or without Type 2 Diabetes Melitus (T2DM). Diagnosis of cirrhosis must be based on histology (historical data is acceptable) or on clinical evidence of cirrhosis (e.g. platelet count \< 150 x 109/L \[150 x 103/microlitre (μL)\], nodular liver surface on imaging or splenomegaly etc.) Diagnosis of NASH based on either i. Current or historic histological diagnosis of NASH OR steatosis OR ii. Clinical diagnosis of NASH based on histor…