Do not interrupt the script when SonarCloud is disabled

Author: jaaufauvre

.travis.yml

@@ -6,8 +6,6 @@ matrix:
   include:
   - dotnet: 2.1.500
     mono: none
-    env: 
-      - WITH_SONAR_ANALYSIS=false
   - dotnet: 2.1  # latest available release
     mono: none  
     env: 
@@ -16,20 +14,20 @@ matrix:
 solution: Mastercard.Developer.OAuth1Signer.sln
 install:
   - dotnet restore
-  - $WITH_SONAR_ANALYSIS && dotnet tool install --global dotnet-sonarscanner
+  - test $WITH_SONAR_ANALYSIS && dotnet tool install --global dotnet-sonarscanner || echo 'Skipping sonarscanner install'
 before_script:
   - export PATH="$PATH:$HOME/.dotnet/tools"
   - |
-    $WITH_SONAR_ANALYSIS && dotnet sonarscanner begin \
+    test $WITH_SONAR_ANALYSIS && dotnet sonarscanner begin \
     /k:"$SONAR_PROJECT_KEY" \
     /n:"$SONAR_PROJECT_NAME" \
     /d:sonar.organization="$SONAR_ORGANIZATION_KEY" \
     /d:sonar.host.url="$SONAR_URL" \
     /d:sonar.login="$SONAR_TOKEN" \
     /d:sonar.cs.vstest.reportsPaths="${TEST_RESULTS_PATH}/tests.trx" \
-    /d:sonar.cs.opencover.reportsPaths="${TEST_RESULTS_PATH}/coverage.xml"
+    /d:sonar.cs.opencover.reportsPaths="${TEST_RESULTS_PATH}/coverage.xml" || echo 'Skipping sonarscanner begin'
 script:
   - dotnet test -c Release -l:"trx;LogFileName=tests.trx" -r:"bin/" /p:CollectCoverage=true /p:CoverletOutputFormat="opencover" /p:CoverletOutput="bin/coverage.xml"
   - dotnet publish -c Release
 after_success:
-  - $WITH_SONAR_ANALYSIS && dotnet sonarscanner end /d:sonar.login="$SONAR_TOKEN"
+  - test $WITH_SONAR_ANALYSIS && dotnet sonarscanner end /d:sonar.login="$SONAR_TOKEN" || echo 'Skipping sonarscanner end'