RFR: 1393: PR bot fails on missing .jcheck/conf [v7]

[Zhao Song]

> SKARA-1393 describes a problem related with `.jcheck/conf` missing.
> 
> In this patch, when the problem happens, the author of this pull request will get instructions about how to solve this problem.

Zhao Song has updated the pull request incrementally with two additional commits since the last revision:

 - Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/CommitCommandWorkItem.java
   
   Co-authored-by: Erik Joelsson <37597443+erikj79 at users.noreply.github.com>
 - Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/CommitCommandWorkItem.java
   
   Co-authored-by: Erik Joelsson <37597443+erikj79 at users.noreply.github.com>

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1407/files
  - new: https://git.openjdk.org/skara/pull/1407/files/aa1a9549..eb2ba54f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1407&range=06
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1407&range=05-06

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/skara/pull/1407.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1407/head:pull/1407

PR: https://git.openjdk.org/skara/pull/1407