FDS Output: allow more descriptive error messages when std::exception is thrown

Previously, we would only print exception description if the exception
was of type FDS_exception, otherwise we would fail with "Unknown error",
which does not help with figuring out what the problem was at all.

We ourselves throw descriptive exceptions of type std::runtime_error for
example in case of Config parsing errors, that would never get printed
in the original state, and instead we'd still fail with "Unknown error".

Author: sedmicha

src/plugins/output/fds/src/fds.cpp

@@ -82,7 +82,7 @@ ipx_plugin_init(ipx_ctx_t *ctx, const char *params)
         window_check(*instance);
         // Everything seems OK
         ipx_ctx_private_set(ctx, instance.release());
-    } catch (const FDS_exception &ex) {
+    } catch (const std::exception &ex) {
         IPX_CTX_ERROR(ctx, "Initialization failed: %s", ex.what());
         return IPX_ERR_DENIED;
     } catch (...) {