Implement workaround for Android group ID compatibility bug

SignalServiceKit/src/Loki/Protocol/Utilities/LKGroupUtilities.m

@@ -1,4 +1,6 @@
 #import "LKGroupUtilities.h"
+#import "NSData+OWS.h"
+#import <SessionServiceKit/SessionServiceKit-Swift.h>
 
 @implementation LKGroupUtilities
 
@@ -64,8 +66,12 @@
 
 +(NSData *)getDecodedGroupIDAsData:(NSData *)groupID
 {
+    // FIXME: This needs to be cleaned up. A lot.
     OWSAssertDebug(groupID.length > 0);
-    NSString *encodedGroupID = [[NSString alloc]initWithData:groupID encoding:NSUTF8StringEncoding];
+    NSString *encodedGroupID = [[NSString alloc] initWithData:groupID encoding:NSUTF8StringEncoding];
+    if (encodedGroupID == nil && [ECKeyPair isValidHexEncodedPublicKeyWithCandidate:[groupID hexadecimalString]]) {
+        return groupID; // Workaround to make things compatible with Android
+    }
     NSString *decodedGroupID = [encodedGroupID componentsSeparatedByString:@"!"][0];
     if ([encodedGroupID componentsSeparatedByString:@"!"].count > 1) {
         decodedGroupID = [encodedGroupID componentsSeparatedByString:@"!"][1];