Merge branch 'hotfix/0.12.3'

Author: matkoch

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [vNext]
 
+## [0.12.4] / 2018-12-02
+- Fixed `SolutionAttribute` to handle empty configuration file
+
 ## [0.12.3] / 2018-11-29
 - Fixed `EnvironmentInfo.Variables` not to be cached
 - Fixed `Glob` package reference in legacy template
@@ -216,7 +219,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Added CLT tasks for Git
 - Fixed background color in console output
 
-[vNext]: https://github.com/nuke-build/nuke/compare/0.12.3...HEAD
+[vNext]: https://github.com/nuke-build/nuke/compare/0.12.4...HEAD
+[0.12.4]: https://github.com/nuke-build/nuke/compare/0.12.3...0.12.4
 [0.12.3]: https://github.com/nuke-build/nuke/compare/0.12.2...0.12.3
 [0.12.2]: https://github.com/nuke-build/nuke/compare/0.12.1...0.12.2
 [0.12.1]: https://github.com/nuke-build/nuke/compare/0.12.0...0.12.1

source/Nuke.Common/ProjectModel/SolutionAttribute.cs

@@ -84,13 +84,15 @@ private string GetSolutionFile(string memberName)
         private string GetSolutionFileFromConfigurationFile()
         {
             var nukeFile = Path.Combine(NukeBuild.RootDirectory, NukeBuild.ConfigurationFileName);
-            ControlFlow.Assert(File.Exists(nukeFile), $"File.Exists({NukeBuild.ConfigurationFileName})");
+            ControlFlow.Assert(File.Exists(nukeFile), $"File.Exists({nukeFile})");
 
-            var solutionFileRelative = File.ReadAllLines(nukeFile)[0];
-            ControlFlow.Assert(!solutionFileRelative.Contains(value: '\\'), $"{NukeBuild.ConfigurationFileName} must use unix-styled separators");
+            var solutionFileRelative = File.ReadAllLines(nukeFile).ElementAtOrDefault(0);
+            ControlFlow.Assert(solutionFileRelative != null && !solutionFileRelative.Contains(value: '\\'),
+                $"First line of {NukeBuild.ConfigurationFileName} must provide solution path using UNIX separators");
 
             var solutionFile = Path.GetFullPath(Path.Combine(NukeBuild.RootDirectory, solutionFileRelative));
-            ControlFlow.Assert(File.Exists(solutionFile), $"Solution file '{solutionFile}' does not exist.");
+            ControlFlow.Assert(File.Exists(solutionFile),
+                $"Solution file '{solutionFile}' provided via {NukeBuild.CompletionFileName} does not exist.");
 
             return (PathConstruction.AbsolutePath) solutionFile;
         }