Don't entirely die just because a plugin jar was bad

patches/server/0020-Plugin-remapping.patch

@@ -377,7 +377,7 @@ index 0000000000000000000000000000000000000000..d738b31f0005aca352a511c1a57e76b6
 +}
 diff --git a/src/main/java/io/papermc/paper/pluginremap/PluginRemapper.java b/src/main/java/io/papermc/paper/pluginremap/PluginRemapper.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..265c636abfd63f9ba0b0f0198867a10401c14da1
+index 0000000000000000000000000000000000000000..28857d0c9b53f2068d51b8f09ef40df7a2b97502
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/pluginremap/PluginRemapper.java
 @@ -0,0 +1,438 @@
@@ -719,7 +719,7 @@ index 0000000000000000000000000000000000000000..265c636abfd63f9ba0b0f0198867a104
 +                }
 +            }
 +        } catch (final IOException ex) {
-+            throw new RuntimeException("Failed to open plugin jar " + inputFile, ex);
++            return CompletableFuture.failedFuture(new RuntimeException("Failed to open plugin jar " + inputFile, ex));
 +        }
 +
 +        return this.reobf.remapped().thenApplyAsync(reobfServer -> {