Improved error handling when ".open" fails in the CLI.

FossilOrigin-Name: 38544b11f0e19cc6c6f8230a89d28e36c7c3587481deaac6cedbf82338ca0d47

manifest

@@ -1,5 +1,5 @@
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-D 2023-05-08T13:38:14.485
+C Improved\serror\shandling\swhen\s".open"\sfails\sin\sthe\sCLI.
+D 2023-05-08T13:47:38.883
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@@ -636,7 +636,7 @@ F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
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@@ -2068,8 +2068,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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 # Remove this line to create a well-formed Fossil manifest.