Fix some logic found during e2e testing (#178)

Fix CI
* parenthesis for order of operations || &&
* master, not main

.github/workflows/ci-e2e.yml

@@ -37,10 +37,10 @@ jobs:
         with:
           dotnet-version: 6.0.x
 
-      - name: Check if there is a corresponding branch in Machine
+      - name: Check if there is a corresponding branch in Serval
         id: find_matching_branch
         continue-on-error: true
-        if: ${{ github.ref_name }} != "main"
+        if: ${{ github.ref_name }} != "master"
         run: cd .. && git clone https://github.com/sillsdev/serval.git --branch ${{ github.ref_name }} && dotnet build machine && dotnet build serval && docker compose -f "serval/docker-compose.yml" up -d && sleep 20
 
       - name: Get Serval and start containers
@@ -65,10 +65,10 @@ jobs:
         if: ${{ failure() }}
         run: docker ps -a && docker logs --since 10m serval_cntr && docker logs --since 10m echo_cntr && docker logs --since 10m machine-engine-cntr && docker logs --since 10m serval-mongo-1 && docker logs --since 10m machine-job-cntr
 
-      - name: Stop containers branch
-        if: (${{ success() || failure() }} && steps.find_matching_branch.outcome != 'success')
+      - name: Stop containers main
+        if: ${{ (success() || failure()) && (steps.find_matching_branch.outcome != 'success')}}
         run: docker compose -f "../tmp/serval/docker-compose.yml" down
 
-      - name: Stop containers main
-        if: (${{ success() || failure() }} && steps.find_matching_branch.outcome == 'success')
+      - name: Stop containers branch
+        if: ${{ (success() || failure()) && (steps.find_matching_branch.outcome == 'success')}}
         run: docker compose -f "../serval/docker-compose.yml" down

src/SIL.Machine.AspNetCore/Services/NmtPreprocessBuildJob.cs

@@ -121,8 +121,10 @@ CancellationToken cancellationToken
         foreach (Corpus corpus in corpora)
         {
             ITextCorpus[] sourceTextCorpora = _corpusService.CreateTextCorpora(corpus.SourceFiles).ToArray();
-            ITextCorpus? targetTextCorpus = _corpusService.CreateTextCorpora(corpus.TargetFiles).FirstOrDefault();
-            if (sourceTextCorpora.Length == 0 || targetTextCorpus is null)
+            ITextCorpus targetTextCorpus =
+                _corpusService.CreateTextCorpora(corpus.TargetFiles).FirstOrDefault() ?? new DictionaryTextCorpus();
+
+            if (sourceTextCorpora.Length == 0)
                 continue;
 
             int skipCount = 0;