Fixed abrupt crash if BLE address is empty string, and created testing version of V3.5.0

app/release/output-metadata.json

@@ -12,7 +12,7 @@
       "filters": [],
       "properties": [],
       "versionCode": 72,
-      "versionName": "3.4.0",
+      "versionName": "3.5.0a",
       "enabled": true,
       "outputFile": "app-release.apk"
     }

app/src/main/AndroidManifest.xml

@@ -3,7 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="uk.org.openseizuredetector"
     android:versionCode="72"
-    android:versionName="3.5.0">
+    android:versionName="3.5.0a">
     <!-- android:allowBackup="false" -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

app/src/main/java/uk/org/openseizuredetector/SdDataSourceBLE.java

@@ -149,7 +149,13 @@ public class SdDataSourceBLE extends SdDataSource {
             return;
         }
 
-        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(mBleDeviceAddr);
+        BluetoothDevice device;
+        try {
+            device = mBluetoothAdapter.getRemoteDevice(mBleDeviceAddr);
+        } catch (Exception e) {
+            Log.w(TAG, "bleConnect(): Error connecting to device address "+mBleDeviceAddr+".");
+            device = null;
+        }
         if (device == null) {
             Log.w(TAG, "bleConnect(): Device not found.  Unable to connect.");
             return;