Allow a null `rootUri` during initialization instead of crashing

[Neil Hansen]

Describe the bug
I'm trying to get clojure-lsp working with Helix and Babashka. I'm finding that the language server crashes immediately when opening a .clj file without a git repo.

Helix does not send rootUri to language servers if you're not in a git repo, which causes the crash. One-off .clj files seems to be a common workflow with Babashka, so I figure clojure-lsp should support this.

To Reproduce
Steps to reproduce the behavior:

1. Created an empty file ~/Desktop/bb.clj
2. Start Helix withhx ~/Desktop/bb.clj

clojure-lsp crashes immediately.

Expected behavior
clojure-lsp should work normally in Helix without a rootUri.

Screenshots

2024-05-16T17:10:34.261Z  INFO [clojure-lsp.server:627] - [SERVER] Starting server...
2024-05-16T17:10:34.308Z  DEBUG [clojure-lsp.nrepl:21] - nrepl not found, skipping nrepl server start...
2024-05-16T17:10:34.321Z  INFO [clojure-lsp.server:509] - Initializing...
2024-05-16T17:10:34.328Z  ERROR [clojure-lsp.server:55] - Error receiving message: Internal error (-32603)
{:id 0, :method "initialize"}
com.oracle.svm.core.posix.thread.PosixPlatformThreads.pthreadStartRoutine  PosixPlatformThreads.java:  211
            com.oracle.svm.core.thread.PlatformThreads.threadStartRoutine       PlatformThreads.java:  833
                                                     java.lang.Thread.run                Thread.java: 1583
                                                 java.lang.Thread.runWith                Thread.java: 1596
                       java.util.concurrent.ThreadPoolExecutor$Worker.run    ThreadPoolExecutor.java:  642
                        java.util.concurrent.ThreadPoolExecutor.runWorker    ThreadPoolExecutor.java: 1144
                                                                      ...                                 
                                        clojure.core.async/thread-call/fn                  async.clj:  486
                                            lsp4clj.server/thread-loop/fn                 server.clj:  122
                                             lsp4clj.server.ChanServer/fn                 server.clj:  260
                                lsp4clj.server.ChanServer/receive-request                 server.clj:  365
                                  lsp4clj.server/pending-received-request                 server.clj:  181
                                                                      ...                                 
                                                    clojure-lsp.server/fn                 server.clj:  520
                             clojure-lsp.shared/normalize-uri-from-client                 shared.clj:  546
                                              clojure.string/starts-with?                 string.clj:  365
java.lang.NullPointerException: 

User details (please complete the following information):

• OS: MacOS
• Editor: Helix
• Version: clojure-lsp 2024.04.22-11.58.08-nightly

[Andrew Breidenbach]

@neilyio, in the meantime you can add (or just touch) a deps.edn adjacent to your script.

You could also add a root to your .config/helix/languages.toml (see https://github.com/helix-editor/helix/blob/master/languages.toml#L2258)