Improve exception handling to match Codacy rules

Rewrite a few generic parts of the code to be more specific in what they
 handle, or how they handle the resulting data structure.

pricenode/src/main/java/bisq/price/spot/ExchangeRateProvider.java

@@ -211,13 +211,15 @@ public Collection<CurrencyPair> getCurrencyPairs() {
                             log.error("Could not query tickers for " + getName(), e);
                         }
                     });
-        } catch (ExchangeException | // Errors reported by the exchange (rate limit, etc)
-                IOException | // Errors while trying to connect to the API (timeouts, etc)
-                IllegalArgumentException // Potential error when integrating new exchange
-                                         // (hints that exchange impl. needs to overwrite
-                                         // requiresFilterDuringBulkTickerRetrieval()
-                                         // and have it return true )
-                e) {
+        } catch (
+                // Errors reported by the exchange (rate limit, etc)
+                ExchangeException |
+                // Errors while trying to connect to the API (timeouts, etc)
+                IOException |
+                // Potential error when integrating new exchange (hints that exchange
+                // provider implementation needs to overwrite
+                // requiresFilterDuringBulkTickerRetrieval() and have it return true )
+                IllegalArgumentException e) {
             // Catch and handle all other possible exceptions
             // If there was a problem with polling this exchange, return right away,
             // since there are no results to parse and process
@@ -243,8 +245,7 @@ public Collection<CurrencyPair> getCurrencyPairs() {
                     String otherExchangeRateCurrency;
                     if (t.getCurrencyPair().base.equals(Currency.BTC)) {
                         otherExchangeRateCurrency = t.getCurrencyPair().counter.getCurrencyCode();
-                    }
-                    else {
+                    } else {
                         otherExchangeRateCurrency = t.getCurrencyPair().base.getCurrencyCode();
                     }