Fixed bug disabling server startup

For further information please take a look at the first Javadoc comment
in envoy.data.Config

server/src/main/java/envoy/server/processors/IssueProposalProcessor.java

@@ -40,7 +40,7 @@ public final class IssueProposalProcessor implements ObjectProcessor<IssuePropos
 			// Two types of authorization are currently supported: access token as
 			// query param or access token as authorization header
 			final var authenticationToken = config.getIssueAuthToken();
-			if (authenticationToken != null) {
+			if (!authenticationToken.equals("")) {
 				final String auth = "token " + authenticationToken;
 				connection.setRequestProperty("Authorization", auth);
 			}