Handle new type of Electrum Server error.

fixes #872

backend/src/api/bitcoin/electrum-api.ts

@@ -87,11 +87,8 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
         },
         'electrum': true,
       };
-    } catch (e) {
-      if (e === 'failed to get confirmed status') {
-        e = 'The number of transactions on this address exceeds the Electrum server limit';
-      }
-      throw new Error(typeof e === 'string' ? e : 'Error');
+    } catch (e: any) {
+      throw new Error(typeof e === 'string' ? e : e && e.message || e);
     }
   }
 
@@ -124,12 +121,9 @@ class BitcoindElectrsApi extends BitcoinApi implements AbstractBitcoinApi {
       }
 
       return transactions;
-    } catch (e) {
+    } catch (e: any) {
       loadingIndicators.setProgress('address-' + address, 100);
-      if (e === 'failed to get confirmed status') {
-        e = 'The number of transactions on this address exceeds the Electrum server limit';
-      }
-      throw new Error(typeof e === 'string' ? e : 'Error');
+      throw new Error(typeof e === 'string' ? e : e && e.message || e);
     }
   }