[FIR] Fix missing linebreaks in rendering of NONE_APPLICABLE

#KT-80684 Fixed

Author: cypressious

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDiagnosticRenderers.kt

@@ -450,15 +450,13 @@ object FirDiagnosticRenderers {
             for ((symbol, diagnostics) in list) {
                 append(SYMBOL.render(symbol))
 
-                if (diagnostics.isEmpty()) {
-                    continue
-                }
-
-                appendLine(":")
+                if (diagnostics.isNotEmpty()) {
+                    appendLine(":")
 
-                diagnostics.forEach {
-                    append("  ")
-                    appendLine(it)
+                    diagnostics.forEach {
+                        append("  ")
+                        appendLine(it)
+                    }
                 }
 
                 appendLine()

compiler/testData/diagnostics/tests/noneApplicableMessage.fir.diag.txt

@@ -1,5 +1,15 @@
 /noneApplicableMessage.fir.kt:(114,121): error: None of the following candidates is applicable:
 
-fun println(message: Any?): Unitfun println(message: Int): Unitfun println(message: Long): Unitfun println(message: Byte): Unitfun println(message: Short): Unitfun println(message: Char): Unitfun println(message: Boolean): Unitfun println(message: Float): Unitfun println(message: Double): Unitfun println(message: CharArray): Unit
+fun println(message: Any?): Unit
+fun println(message: Int): Unit
+fun println(message: Long): Unit
+fun println(message: Byte): Unit
+fun println(message: Short): Unit
+fun println(message: Char): Unit
+fun println(message: Boolean): Unit
+fun println(message: Float): Unit
+fun println(message: Double): Unit
+fun println(message: CharArray): Unit
+
 
 /noneApplicableMessage.fir.kt:(124,134): error: Unresolved reference 'unresolved'.