chores(analyzer): Print warning if duplicate packages

When duplicate packages or projects are found in the dependency tree, print a
warning instead of throwing an exception and inteerrupting the scan.
Duplicate packages may arise when the same package is imported twice, in these
cases the dependency tree will be completed as the package is imported at
least once.

Signed-off-by: Stefano Bennati <[email protected]>

Author: bennati

analyzer/src/main/kotlin/AnalyzerResultBuilder.kt

@@ -17,6 +17,8 @@
  * License-Filename: LICENSE
  */
 
+import org.apache.logging.log4j.kotlin.logger
+
 package org.ossreviewtoolkit.analyzer
 
 import org.ossreviewtoolkit.model.AnalyzerResult
@@ -41,9 +43,8 @@ class AnalyzerResultBuilder {
 
     fun build(excludes: Excludes = Excludes.EMPTY): AnalyzerResult {
         val duplicates = (projects.map { it.toPackage() } + packages).getDuplicates { it.id }
-        require(duplicates.isEmpty()) {
-            "Unable to create the AnalyzerResult as it contains packages and projects with the same ids: " +
-                duplicates.values
+        if (duplicates.isNotEmpty()) {
+            logger.warn {"Unable to create the AnalyzerResult as it contains packages and projects with the same ids: ${duplicates.values}"}
         }
 
         return AnalyzerResult(projects, packages, issues, dependencyGraphs)