Fix IsolatedStorage initialization on Android (#56534)

Android doesn't set an entry assembly so we need to handle that case.

Fixes #52332

Author: akoeplinger

src/libraries/System.IO.IsolatedStorage/src/System/IO/IsolatedStorage/Helper.Win32Unix.cs

@@ -46,35 +46,37 @@ internal static void GetDefaultIdentityAndHash(out object identity, out string h
             // by pulling directly from EntryAssembly.
             //
             // Note that it is possible that there won't be an EntryAssembly, which is something the .NET Framework doesn't
-            // have to deal with and shouldn't be likely on .NET Core due to a single AppDomain. Without Evidence
-            // to pull from we'd have to dig into the use case to try and find a reasonable solution should we
-            // run into this in the wild.
+            // have to deal with and isn't likely on .NET Core due to a single AppDomain. The exception is Android which
+            // doesn't set an EntryAssembly.
 
             Assembly? assembly = Assembly.GetEntryAssembly();
+            string? location = null;
 
-            if (assembly == null)
-                throw new IsolatedStorageException(SR.IsolatedStorage_Init);
-
-            AssemblyName assemblyName = assembly.GetName();
-
-            hash = IdentityHelper.GetNormalizedStrongNameHash(assemblyName)!;
-            if (hash != null)
+            if (assembly != null)
             {
-                hash = "StrongName" + separator + hash;
-                identity = assemblyName;
-            }
-            else
-            {
-                string? location = assembly.Location;
-                // In case of SingleFile deployment, Assembly.Location is empty.
-                if (location == string.Empty)
-                    location = Environment.ProcessPath;
-                if (string.IsNullOrEmpty(location))
-                    throw new IsolatedStorageException(SR.IsolatedStorage_Init);
-                Uri locationUri = new Uri(location);
-                hash = "Url" + separator + IdentityHelper.GetNormalizedUriHash(locationUri);
-                identity = locationUri;
+                AssemblyName assemblyName = assembly.GetName();
+
+                hash = IdentityHelper.GetNormalizedStrongNameHash(assemblyName)!;
+                if (hash != null)
+                {
+                    hash = "StrongName" + separator + hash;
+                    identity = assemblyName;
+                    return;
+                }
+                else
+                {
+                    location = assembly.Location;
+                }
             }
+
+            // In case of SingleFile deployment, Assembly.Location is empty. On Android there is no entry assembly.
+            if (string.IsNullOrEmpty(location))
+                location = Environment.ProcessPath;
+            if (string.IsNullOrEmpty(location))
+                throw new IsolatedStorageException(SR.IsolatedStorage_Init);
+            Uri locationUri = new Uri(location);
+            hash = "Url" + separator + IdentityHelper.GetNormalizedUriHash(locationUri);
+            identity = locationUri;
         }
 
         internal static string GetRandomDirectory(string rootDirectory, IsolatedStorageScope scope)